Food for two persons suffices three persons and food for three persons suffices four persons.
Sahih Muslim Book 36, Hadith 241
← Previous Hadith There came to our house some guests. It was a common practice with my father to (go) and talk to Allah's Messenger (ﷺ) during the night. While going he said: 'Abd al-Rahman, entertain the guests. When it was evening we served the food to them, but they refused saying: So long as the owner of the house does not come and join us, we would not take the meal. I said to them: He ('Abd Bakr) is a stern person, and if you would not do that (if you do not take the food). I fear, I may be harmed by him, but they refused. As he (my father) came, the first thing he asked was: Have you served the guests? They (the peopleof the household) said: We have not served them sofar. He said: Did I not command 'Abd al-Rahman (to do this)? He ('Abd al-Rahman) said: I slunk away and kept myself away by that time. He again said: O stupid fellow, I ask you on oath that In case you hear my voice you come to me. I came and said: By Allah, there is no fault of mine. These are your guests; you may ask them. I provided them with food but they refused to eat until you came. He said to them: Why is it that you did not accept our food? By Allah, I shall not even take food tonight (as you have not taken). They said: By Allah, we would not take until you join us. Thereupon he Abu Bakr) said: I have never seen a more unfortunate night than this. Woe be to thee! that you do not accept from us food prepared for you. He again said: What I did first (that is the taking of vow for not eating the food) was prompted by the Satan. Bring the food. The food was brought, and he ate by reciting the name of Allah and they also ate, and when it was morning he came to Allah's Apostle (ﷺ) and said: Allah's Messenger, their oath (that of the guests) came to be true, but mine was not true, and after that he informed him of the whole incident. He said: Your oath came to be the most true and you are the best of them. He (the narrator) said. I do not know whether he made an atonement for it.

Sahih Muslim Book 36, Hadith 240 Next Hadith → I heard Allah'. s Messenger (ﷺ) as saying: Food for one person suffices two persons and food for two persons suffices four persons, and food for four persons suffices eight persons; and in the tradition transmitted on the authority of Ishaq there is no mention of the fact that he heard it directly (from the Holy Prophet).

Sahih Muslim Book 36, Hadith 242