صحيح البخاري

Narrated `Ali:

Fatima complained of the suffering caused to her by the hand mill. Some Captives were brought to the Prophet, she came to him but did not find him at home `Aisha was present there to whom she told (of her desire for a servant). When the Prophet (ﷺ) came, Aisha informed him about Fatima's visit. `Ali added "So the Prophet (ﷺ) came to us, while we had gone to our bed I wanted to get up but the Prophet (ﷺ) said, "Remain at your place". Then he sat down between us till I found the coolness of his feet on my chest. Then he said, "Shall I teach you a thing which is better than what you have asked me? When you go to bed, say, 'Allahu-Akbar' thirty-four times, and 'Subhan Allah thirty-three times, and 'Al hamdu-li l-lah thirty-three times for that is better for you both than a servant."