(the wife of the Prophet) that while Allah's Messenger (ﷺ) was with her, she heard a voice of a man asking
permission to enter the house of Hafsa. `Aisha added: I said, "O Allah's Messenger (ﷺ)! This man is asking
permission to enter your house." The Prophet (ﷺ) said, "I think he is so-and-so," naming the foster-uncle
of Hafsa. `Aisha said, "If so-and-so," naming her foster uncle, "were living, could he enter upon me?"
The Prophet (ﷺ) said, "Yes, for foster suckling relations make all those things unlawful which are
unlawful through corresponding birth (blood) relations."
Sahih al-Bukhari Book 67, Hadith 37
Ibn Shihab said: “Salim read to me a letter that the Messenger of Allah had written concerning Sadaqat, before Allah caused him to pass away, in which it was said: 'For five camels one sheep; for ten, two sheep; for twenty, four sheep. For twenty five, a Bint Makhad(a one year old she-camel), up to thirty-five; if there is no Bint Makhad, then a Bin Labun ( a two-year-old male camel). If there are more than thirty-five even one, then a Bint Labun ( a two-year-old she-camel) must be given up to forty-five. If there are more than forty-five, even one, then a Hiqqah (a three-year-old she-camel), up to sixty camels. If there are more than sixty, even one more, then a Jadha'ah ( a four-year-old she-camel) must be given, up to seventy-five. If there are more than seventy-five, even one more, then two Bint Labun must be given, upto ninety. If there are more than ninety, even one more, then two Hiqqah must be given, up to one hundred and twenty. If there are many camels, then for each fifty, one Hiqqah must be given and for each forty a Bint Labun' ”
Sunan Ibn Majah Book 8, Hadith 16
There was a man called Abu Shu'aib, and he had a slave who was a butcher. He said (to his slave),
"Prepare a meal to which I may invite Allah's Messenger (ﷺ) along with four other men." So he invited
Allah's Messenger (ﷺ) and four other men, but another man followed them whereupon the Prophet (ﷺ) said,
"You have invited me as one of five guests, but now another man has followed us. If you wish you
can admit him, and if you wish you can refuse him." On that the host said, "But I admit him."
Narrated Muhammad bin Isma`il: If guests are sitting at a dining table, they do not have the right to
carry food from other tables to theirs, but they can pass on food from their own table to each other;
otherwise they should leave it.
Sahih al-Bukhari Book 70, Hadith 62