We used to practise 'azl while the Qur'an was revealed (during the days when the Prophet was alive).

We used to practise 'azl during the life of Allah's Messenger (ﷺ).

I intended to prohibit cohabitation with a suckling woman until I considered that the Romans and the Persians do it without any injury being caused to their children thereby. (Imam Muslim said: Khalaf reported it from Judamat al-'Asadiyya, but the correct wording is what has been stated by Yahya.)

Yes. (I heard) Allah's Apostle (ﷺ) as saying: There is no harm if you do not practise it, for it (the birth of the child) is something ordained (by Allah).

This hadith is reported on the authority of Abu Sa'id with the same chain of transmitters but with a slight variation (of words).

Did you hear Allah's Messenger (ﷺ) making a mention of something in regard to al-'azl? Thereupon he said: Yes. The rest (of the hadith is the same)

The child does not come from all the liquid (sermen) and when Allah intends to create anything nothing can prevent it (from coming into existence).

A hadith like this has been transmitted by Abu Sa'id from Allah's Apostle (ﷺ).

I have a slave-girl who is our servant and she carries water for us and I have intercourse with her, but I do not want her to conceive. He said: Practise 'azl, if you so like, but what is decreed for her will come to her. The person stayed back (for some time) and then came and said: The girl has become pregnant, whereupon he said: I told you what was decreed for her would come to her.

Perhaps he (the man accompanying her) intends to cohabit with her. They said: Yes. Thereupon Allah's Messenger (ﷺ) said: I have decided to curse him with such a curse as may go along with him to his grave. How can he own him (the child to be born) and that is not lawful for him, and how can he take him as a servant for that is not lawful for him?