Anas (may Allah be pleased with him) reported that Abu Talhah said to Umm Sulaym: "I felt some feebleness in the voice of the Messenger of Allah (may Allah's peace and blessings be upon him) and perceived that it was due to hunger; so have you anything with you?" She replied in the affirmative, and brought out barley loaves, then took out a head-covering of hers, in a part of which she wrapped those loaves and then put them beneath my mantle and covered me with a part of it. She then sent me to the Messenger of Allah (may Allah's peace and blessings be upon him). I [Anas] set forth and found the Messenger of Allah (may Allah's peace and blessings be upon him) sitting in the mosque and some companions were with him. I stood near them, whereupon the Messenger of Allah (may Allah's peace and blessings be upon him) said: "Has Abu Talhah sent you?" I replied in the affirmative, whereupon he said: "Is it for a feast?" I replied in the affirmative. Thereupon the Messenger of Allah (may Allah's peace and blessings be upon him) said to those who were with him to get up. They set off and so I did before them, until I came to Abu Talhah and informed him. Abu Talhah said: "O Umm Sulaym, the Messenger of Allah (may Allah's peace and blessings be upon him) has arrived along with some people and we do not have enough to feed them?" She said: "Allah and His Messenger know best." Abu Talhah went out (to receive him) until he met the Messenger of Allah (may Allah's peace and blessings be upon him) he proceeded along with him until they both entered. Then the Messenger of Allah (may Allah's peace and blessings be upon him) said: "O Umm Sulaym, bring forth that which you have with you," and she brought such bread. The Messenger of Allah (may Allah's peace and blessings be upon him) then commanded that the bread be broken into small pieces, and when Umm Sulaym had squeezed a container of fat on it as a dressing, the Messenger of Allah (may Allah's peace and blessings be upon him) said whatever that Allah willed him to say over it. He then said: "Allow ten to enter." He permitted them, and they ate until they were satiated. They then went out. He again said: "Allow ten more," and he permitted them and they ate until all the people were satiated, and they were seventy or eighty men" [Al-Bukhāri and Muslim]. In another narration: "They continued to enter and exit, ten at a time, until no one remained who had not entered and eaten to his fill. He then collected the leftovers and it was the same quantity as what had been eaten." In another narration: "They ate ten at a time, until eighty people had eaten. Then the Prophet (may Allah's peace and blessings be upon him) and the hosts ate, and they left a surplus." In another narration: "There was enough leftover to feed their neighbors." In another narration reported by Anas who said: "One day I came to the Messenger of Allah (may Allah's peace and blessings be upon him) and found him sitting with his companions, and he had tied his belly with a bandage. I asked some of his companions why the Messenger of Allah (may Allah's peace and blessings be upon him) had bandaged his belly. They said that it was due to hunger. I then went to Abu Talhah, the husband of Umm Sulaym bint Milhān, and said to him: "Father, I saw the Messenger of Allah (may Allah's peace and blessings be upon him) having bandaged his belly. I asked some of his companions the reason and they said that it was due to hunger." Abu Talhah came to my mother and said: "Is there anything?" She said: "Yes, I have some pieces of bread with me and some dates. If the Messenger of Allah (may Allah's peace and blessings be upon him) comes to us alone we can feed him to his fill, but if someone comes along with him this would be insufficient for them." And he mentioned the rest of the Hadīth.
Authentic hadith -
Narrated by Bukhari & Muslim