Sahih al-Bukhari Book 46, Hadith 16
"We were in Medina with some of the Iraqi people, and we were struck with famine and Ibn Az-
Zubair used to give us dates. Ibn `Umar used to pass by and say, "The Prophet (ﷺ) forbade us to eat two
dates at a time, unless one takes the permission of one's companions."
The Prophet (ﷺ) said, "Whoever takes a piece of the land of others unjustly, he will sink down the seven earths on the Day of Resurrection."
There was an Ansari man called Abu Shu'aib who had a slave butcher. Abu Shu'aib said to him, "Prepare a meal sufficient for five persons so that I might invite the Prophet (ﷺ) besides other four persons." Abu Shu'aib had seen the signs of hunger on the face of the Prophet (ﷺ) and so he invited him. Another man who was not invited, followed the Prophet. The Prophet (ﷺ) said to Abu Shu'aib, "This man has followed us. Do you allow him to share the meal?" Abu Shu'aib said, "Yes."