Ibn Mas'ud reported God’s Messenger as saying, “The food on the first day is a duty, that on the second is a sunna, but that on the third day is to make men hear of it; and if anyone makes men hear of what he does God will make him heard of” (i.e. will publish his hypocrisy on the day of resurrection).
A companion of God’s Messenger reported him as saying, “When two people come together to issue an invitation accept that of the one who lives nearer you, but if one of them comes before the other accept the invitation of the one who comes first.”
‘Abdallah b. 'Umar reported God’s Messenger as saying, “He who does not accept an invitation which he receives has disobeyed God and His Messenger, and he who enters without an invitation enters as a thief and goes out as a raider.”