Sahih al-Bukhari Book 69, Hadith 12
Fatima came to the Prophet (ﷺ) asking for a servant. He said, "May I inform you of something better than
that? When you go to bed, recite "Subhan Allah' thirty three times, 'Al hamduli l-lah' thirty three
times, and 'Allahu Akbar' thirty four times. `Ali added, 'I have never failed to recite it ever since."
Somebody asked, "Even on the night of the battle of Siffin?" He said, "Even on the night of the battle of Siffin."
Fatima went to the Prophet (ﷺ) complaining about the bad effect of the stone hand-mill on her hand. She heard that the Prophet (ﷺ) had received a few slave girls. But (when she came there) she did not find him, so she mentioned her problem to `Aisha. When the Prophet (ﷺ) came, `Aisha informed him about that. `Ali added, "So the Prophet (ﷺ) came to us when we had gone to bed. We wanted to get up (on his arrival) but he said, 'Stay where you are." Then he came and sat between me and her and I felt the coldness of his feet on my `Abdomen. He said, "Shall I direct you to something better than what you have requested? When you go to bed say 'Subhan Allah' thirty-three times, 'Al hamduli l-lah' thirty three times, and Allahu Akbar' thirty four times, for that is better for you than a servant."
I asked `Aisha "What did the Prophet (ﷺ) use to do at home?" She said, "He used to work for his family, and when he heard the Adhan (call for the prayer), he would go out."