Sayyidah Umm Hani bint Abi Talib (may Allah be pleased with her) said: I came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah! I used to pray a prayer which has now become heavy for me, so guide me to a deed that I can do while sitting and for which Allah will reward me. He (peace and blessings be upon him) said: "O Umm Hani! When you reach the morning, glorify Allah (say Subhan Allah) a hundred times, declare His oneness (say La ilaha illa Allah) a hundred times, praise Him (say al-Hamdu lillah) a hundred times and declare His greatness (say Allahu Akbar) a hundred times. For a hundred glorifications are equal to a hundred sacrificial camels, and a hundred declarations of His greatness are equal to a hundred sacrificial camels that you offer, and a hundred declarations of His oneness leave no sin remaining, neither before them nor after them."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21363