Musnad Abu Ya'la al-Mawsili 148:42

Wasil ibn Abd al-A’la al-Kufi narrated to us, Ibn Fudayl narrated to us, from Abd al-Rahman ibn Ishaq, from al-Husayn ibn Abi Sufyan, from Anas ibn Malik, who said: The Messenger of Allah (peace be upon him) visited Umm Sulaym and performed a voluntary prayer in her house. He said: "O Umm Sulaym, when you have performed the obligatory prayer, say 'Subhan Allah' (Glory be to Allah) ten times, and 'Allahu Akbar' (Allah is the Greatest) ten times. Then ask for whatever you wish, for He will say to you: 'Yes, yes, yes.'"