Musnad Ahmad 5:576

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from al-Hakam, who said: I heard Ibn Abi Layla, Ali narrated to us, that Fatimah complained of what she was suffering from the effect of the hand-mill on her hand. Some captives were brought to the Prophet, may Allah bless him and grant him peace, so she went [to him], but did not find him. She met ‘Aishah and informed her. When the Prophet, may Allah bless him and grant him peace, came, ‘Aishah informed him of Fatimah’s coming to her. So the Prophet, may Allah bless him and grant him peace, came to us while we had taken to our beds. We went to stand up, but the Prophet, may Allah bless him and grant him peace, said: "Stay in your places." He sat between us, until I felt the coolness of his feet on my chest. He said: "Shall I not teach you something better than what you asked for? When you take to your beds, magnify Allah (say Allahu Akbar) thirty-four times, glorify Him (say SubhanAllah) thirty-three times, and praise Him (say Alhamdulillah) thirty-three times; for that is better for you than a servant."