Musnad Abu Ya'la al-Mawsili 3:291

Abu Musa narrated to us, Uthman bin Umar narrated to us, Isra'il narrated to us, from Abu Ishaq, from Hubayrah, from Ali, who said: I said to Fatimah, "If you were to go to the Prophet, may Allah bless him and grant him peace, and ask him for a servant, for the work has exhausted you." So she went to him, but she did not find him in agreement. He said, "Shall I not guide you both to something better than what you asked for? When you go to your bed, glorify Allah (say SubhanAllah) thirty-three times, praise Him (say Alhamdulillah) thirty-three times, and magnify Him (say Allahu Akbar) thirty-four times. That is one hundred on the tongue and a thousand in the scale."