Sunan Abi Dawud Book 28, Hadith 118
AbulHaytham ibn at-Tayhan prepared food for the Messenger of Allah (ﷺ), and he invited the Prophet (ﷺ) and his Companions. When they finished (food), the said: If some people enter the house of a man, his food is eaten and his drink is drunk, and they supplicate (to Allah) for him, this is his reward.
The Prophet (ﷺ) said: If anyone spends the night with grease on his hand which he has not washed away, he can blame only himself if some trouble comes to him.
The Prophet (ﷺ) came to visit Sa'd ibn Ubaydah, and he brought bread and olive oil, and he ate (them). Them). Then the Prophet (ﷺ) said: May the fasting (men) break their fast with you, and the pious eat your food, and the angels pray for blessing on you.