Musnad Ahmad 1166:25

Sa'id ibn Sulayman narrated to us, he said: Musa ibn Khalaf narrated to us, he said: 'Asim ibn Bahdalah narrated to us, from Abu Salih, from Umm Hani bint Abi Talib, she said: The Messenger of Allah (peace and blessings of Allah be upon him) passed by me one day, and I said: "O Messenger of Allah, I have grown old and weak," or as she said, "so command me with a deed that I may perform while I am sitting." He said: "Glorify Allah (say SubhanAllah) one hundred times, for it is equivalent for you to one hundred slaves you free from the children of Isma'il. Praise Allah (say Alhamdulillah) one hundred times, for it is equivalent for you to one hundred saddled and bridled horses that you carry [people] upon in the way of Allah. Magnify Allah (say Allahu Akbar) one hundred times, for it is equivalent for you to one hundred sacrificial camels that are garlanded and accepted. And declare the oneness of Allah (say La ilaha illallah) one hundred times." Ibn Khalaf said: I think he said, "It fills what is between the heaven and the earth, and on that day, no one’s deed will be raised like yours, unless he brings the like of what you have brought."