[Al-Bukhari].

[Muslim].

In At-Tirmidhi: that the Messenger of Allah (ﷺ) passed through the Masjid one day, and a group of women were sitting, so he motioned his hand with the salam.

[Muslim].

Messenger of Allah (ﷺ) said, "When the people of the Book greet you, respond with: 'Wa 'alaikum' (And upon you)".[Al-Bukhari and Muslim].

The Prophet (ﷺ) passed by a mixed company of people which included Muslims, polytheists and Jews, and he gave them the greeting (i.e., saying As- Salamu 'Alaikum).[Al-Bukhari and Muslim].

[Abu Dawud and At-Tirmidhi].

The Messenger of Allah (ﷺ) said, "Permission is to be sought thrice. If permission is granted, you may enter; otherwise, go back."[Al- Bukhari and Muslim].

The Messenger of Allah (ﷺ) said, "Seeking permission to enter (somebody's house) has been prescribed in order to restrain the eyes (from looking at something we are not supposed to look at)."[Al-Bukhari and Muslim].

A man of Banu 'Amir tribe has told us that he had asked the Prophet (ﷺ) for permission to enter when he was at home. He said: "May I enter?" the Messenger of Allah (ﷺ) said to the servant, "Go out and instruct him about the manner of seeking permission. Tell him to say: As-Salamu 'Alaikum (may peace be upon you). May I come in?" The man heard this and said: "As-Salamu 'Alaikum (may peace be upon you). May I come in?" The Prophet (ﷺ) then granted him permission and he entered.[Abu Dawud].

I visited the Prophet (ﷺ) and I entered his house without seeking permission. So he said, "Go back and say: 'As-Salamu 'alaikum (may peace be upon you). May I come in?"'[Abu Dawud and At- Tirmidhi].

[Al-Bukhari and Muslim].

I stepped out one night and saw the Messenger of Allah (ﷺ) walking by himself. I began to walk in the moonlit night. He turned round and saw me and asked, "Who is there?" I replied: "Abu Dharr."[Al-Bukhari and Muslim].

I went to the Prophet (ﷺ) who was taking a bath while Fatimah was screening him. He asked, "Who is there?" I replied: "I am Umm Hani."[Al- Bukhari and Muslim].

I went to the Prophet (ﷺ) and knocked at the door (to seek permission). He asked, "Who is there?" I said: "I". He repeated, " I, I?!" as if he disliked it.[Al-Bukhari and Muslim].

[Al-Bukhari].

The Prophet (ﷺ) said, "When one of you sneezes he should say: 'Al-hamdu lillah (praise be to Allah),' and his brother or his companion should say to him: 'Yarhamuk-Allah (may Allah have mercy on you).' When he says this he should reply: 'Yahdikum-ullah wa yuslihu balakum (may Allah guide you and render sound your state of affairs)."'[Al- Bukhari].

The Messenger of Allah (ﷺ) said, "When one of you sneezes and praises Allah (i.e., says Al-hamdu lillah), you should invoke Allah's Mercy upon him (i.e., say Yarhamuk-Allah); but if he does not praise Allah, you should not respond." [Muslim].

When two men sneezed in the presence of the Prophet (ﷺ), he responded to one with "Yarhamuk-Allah (may Allah have mercy on you)" and did not respond to the other. The latter said to him: "You invoked a blessing on this man but did not do so in my case." The Prophet (ﷺ) replied, "He praised Allah (i.e., he said 'Al-hamdu lillah') but you did not."[Al-Bukhari and Muslim].

Whenever the Messenger of Allah (ﷺ) sneezed, he would cover his mouth with his hand or a piece of cloth - thereby suppressing the sound.[Abu Dawud and At-Tirmidhi].