The Messenger of Allah ﷺ said, "O Allah, make the provision of the family of Muhammad just enough to sustain them."
حدثنا وكيع قال حدثنا الأعمش عن عمارة بن القعقاع عن أبي زرعة
قال رسول الله ﷺ اللهم اجعل رزق آل محمد قوتا
Its isnad is sahih. It is found in Bukhari with similar wording, 11/283, no. 6460, in the Book of Riqaq, Muslim, 4/2281, no. 1055 M, at the beginning of the Book of Zuhd, and Tirmidhi, 4/580, no. 2361.