This fell heavy on them, and they mentioned this to the Messenger of Allah (ﷺ). So Allah, Most High, revealed the verse: "They ask you concerning orphans. Say: The best thing to do is what is for their good; if ye mix their affairs with yours, they are your brethren." Then they mixed their food with his food and their drink with his drink.
In-book : Book 18, Hadith 10
English translation : Book 17, Hadith 2865