The Prophet (ﷺ) sent Mu'adh to Yemen.

When the Prophet (ﷺ) sent Mu`adh to Yemen, he said to him, "You are going to a nation from the people of the Scripture, so let the first thing to which you will invite them, be the Tauhid of Allah. If they learn that, tell them that Allah has enjoined on them, five prayers to be offered in one day and one night. And if they pray, tell them that Allah has enjoined on them Zakat of their properties and it is to be taken from the rich among them and given to the poor. And if they agree to that, then take from them Zakat but avoid the best property of the people."

The Prophet (ﷺ) said, "O Mu`adh! Do you know what Allah's Right upon His slaves is?" I said, "Allah and His Apostle know best." The Prophet (ﷺ) said, "To worship Him (Allah) Alone and to join none in worship with Him (Allah). Do you know what their right upon Him is?" I replied, "Allah and His Apostle know best." The Prophet (ﷺ) said, "Not to punish them (if they do so).

A man heard another man reciting (in the prayers): 'Say (O Muhammad): "He is Allah, the One." (112.1) And he recited it repeatedly. When it was morning, he went to the Prophet (ﷺ) and informed him about that as if he considered that the recitation of that Sura by itself was not enough. Allah's Messenger (ﷺ) said, "By Him in Whose Hand my life is, it is equal to one-third of the Qur'an."

The Prophet (ﷺ) sent (an army unit) under the command of a man who used to lead his companions in the prayers and would finish his recitation with (the Sura 112): 'Say (O Muhammad): "He is Allah, the One." ' (112.1) When they returned (from the battle), they mentioned that to the Prophet. He said (to them), "Ask him why he does so." They asked him and he said, "I do so because it mentions the qualities of the Beneficent and I love to recite it (in my prayer)." The Prophet; said (to them), "Tell him that Allah loves him."

Allah's Messenger (ﷺ) said, "Allah will not be merciful to those who are not merciful to mankind."

We were with the Prophet (ﷺ) when suddenly there came to him a messenger from one of his daughters who was asking him to come and see her son who was dying. The Prophet (ﷺ) said (to the messenger), "Go back and tell her that whatever Allah takes is His, and whatever He gives is His, and everything with Him has a limited fixed term (in this world). So order her to be patient and hope for Allah's reward." But she sent the messenger to the Prophet (ﷺ) again, swearing that he should come to her. So the Prophet got up, and so did Sa`d bin 'Ubada and Mu`adh bin Jabal (and went to her). When the child was brought to the Prophet (ﷺ) his breath was disturbed in his chest as if it were in a water skin. On that the eyes of the Prophet (ﷺ) became flooded with tears, whereupon Sa`d said to him, "O Allah's Messenger (ﷺ)! What is this?" The Prophet (ﷺ) said, "This is mercy which Allah has put in the heart of His slaves, and Allah bestows His mercy only on those of His slaves who are merciful (to others)."

The Prophet (ﷺ) said, "None is more patient than Allah against the harmful and annoying words He hears (from the people): They ascribe children to Him, yet He bestows upon them health and provision .

The Prophet (ﷺ) said, "The keys of the unseen are five and none knows them but Allah: (1) None knows (the sex) what is in the womb, but Allah: (2) None knows what will happen tomorrow, but Allah; (3) None knows when it will rain, but Allah; (4) None knows where he will die, but Allah (knows that); (5) and none knows when the Hour will be established, but Allah."

`Aisha said, "If anyone tells you that Muhammad has seen his Lord, he is a liar, for Allah says: 'No vision can grasp Him.' (6.103) And if anyone tells you that Muhammad has seen the Unseen, he is a liar, for Allah says: "None has the knowledge of the Unseen but Allah."

We used to pray behind the Prophet (ﷺ) and used to say: "As-Salamu 'Al-Allah. The Prophet (ﷺ) said, "Allah himself is As-Salam (Name of Allah), so you should say: 'at-Tahiyatu lil-lahi was-sala-watu wattaiyibatu, as-salamu `alaika aiyyuha-n-nabiyyu wa rahmatu-l-lahi wa barakatuhu, as-salamu `alaina wa `ala `ibadi-l-lahi as-salihin. Ashhadu an la ilaha il-lallah, wa ash-hadu anna Muhammadan `abduhu wa rasuluhu."'

The Prophet (ﷺ) said, "On the Day of Resurrection Allah will hold the whole earth and fold the heaven with His right hand and say, 'I am the King: where are the kings of the earth?" '

The Prophet (ﷺ) used to say, "I seek refuge (with YOU) by Your 'Izzat, None has the right to be worshipped but You Who does not die while the Jinns and the human beings die."

The Prophet (ﷺ) said, "(The people will be thrown into Hell ( Fire) and it will keep on saying, 'Is there any more?' till the Lord of the worlds puts His Foot over it, whereupon its different sides will come close to each other, and it will say, 'Qad! Qad! (enough! enough!) By Your 'Izzat (Honor and Power) and YOUR KARAM (Generosity)!' Paradise will remain spacious enough to accommodate more people until Allah will create some more people and let them dwell in the superfluous space of Paradise. "

The Prophet (ﷺ) used to invoke Allah at night, saying, "O Allah: All the Praises are for You: You are the Lord of the Heavens and the Earth. All the Praises are for You; You are the Maintainer of the Heaven and the Earth and whatever is in them. All the Praises are for You; You are the Light of the Heavens and the Earth. Your Word is the Truth, and Your Promise is the Truth, and the Meeting with You is the Truth, and Paradise is the Truth, and the (Hell) Fire is the Truth, and the Hour is the Truth. O Allah! I surrender myself to You, and I believe in You and I depend upon You, and I repent to You and with You (Your evidences) I stand against my opponents, and to you I leave the judgment (for those who refuse my message). O Allah! Forgive me my sins that I did in the past or will do in the future, and also the sins I did in secret or in public. You are my only God (Whom I worship) and there is no other God for me (i.e. I worship none but You)."

Narrated Sufyan:

(regarding the above narration) that the Prophet (ﷺ) added, "You are the Truth, and Your Word is the Truth."

We were with the Prophet (ﷺ) on a journey, and whenever we ascended a high place, we used to say, "Allahu Akbar." The Prophet (ﷺ) said, "Don't trouble yourselves too much! You are not calling a deaf or an absent person, but you are calling One Who Hears, Sees, and is very near." Then he came to me while I was saying in my heart, "La hawla wala quwwatta illa billah (There is neither might nor power but with Allah)." He said, to me, "O `Abdullah bin Qais! Say, 'La hawla wala quwwata illa billah (There is neither might nor power but with Allah), for it is one of the treasures of Paradise." Or said, "Shall I tell you of it?"

Abu Bakr As-Siddiq said to the Prophet (ﷺ) "O Allah's Messenger (ﷺ)! Teach me an invocation with which I may invoke Allah in my prayers." The Prophet (ﷺ) said, "Say: O Allah! I have wronged my soul very much (oppressed myself), and none forgives the sins but You; so please bestow Your Forgiveness upon me. No doubt, You are the Oft-Forgiving, Most Merciful."

The Prophet (ﷺ) said, "Gabriel called me and said, 'Allah has heard the statement of your people and what they replied to you.'"

As-Salami: Allah's Messenger (ﷺ) used to teach his companions to perform the prayer of Istikhara for each and every matter just as he used to teach them the Suras from the Qur'an He used to say, "If anyone of you intends to do some thing, he should offer a two rak`at prayer other than the compulsory prayers, and after finishing it, he should say: O Allah! I consult You, for You have all knowledge, and appeal to You to support me with Your Power and ask for Your Bounty, for You are able to do things while I am not, and You know while I do not; and You are the Knower of the Unseen. O Allah If You know It this matter (name your matter) is good for me both at present and in the future, (or in my religion), in my this life and in the Hereafter, then fulfill it for me and make it easy for me, and then bestow Your Blessings on me in that matter. O Allah! If You know that this matter is not good for me in my religion, in my this life and in my coming Hereafter (or at present or in the future), then divert me from it and choose for me what is good wherever it may be, and make me be pleased with it." (See Hadith No. 391, Vol. 8)