Sahih al-Bukhari 3705

It is related from 'Ali, "Fatima, peace be upon her, complained of what she endured from the mill she used for grinding, and she heard that the Messenger of Allah, may Allah bless him and grant him peace, had taken captives. She went to him to ask for a servant and she did not find him. She found 'A'isha and mentioned it to her. When the Prophet, may Allah bless him and grant him peace, came, 'A'isha mentioned to him that Fatima had come. The Prophet, may Allah bless him and grant him peace, came to us when we had gone to bed and I went to get up and he said, 'Stay where you are.' He sat between us until I felt the coolness of his feet on my chest. He said, 'Shall I indicate to you two what is better than what you asked for? When you go to bed, say "Allah is greater" thirty-four times, "Praise be to Allah" thirty-three times, and "Glory be to Allah" thirty-three times. That is better for you than a servant.'"