Musannaf Ibn Abi Shaybah 31158 — Those who used to say: O Turner

Shahr bin Hawshab said: I asked the Mother of the Believers, Sayyidah Umm Salamah (may Allah be pleased with her): "O Mother of the Believers! When the Messenger of Allah (peace and blessings be upon him) was with you, which supplication did he make most often?" She said: "He (peace and blessings be upon him) mostly made this supplication: 'O Turner of hearts! Grant my heart firmness upon Your religion.' Then he (peace and blessings be upon him) said: 'O Umm Salamah! The heart of every human being is between two fingers of Allah; Allah Almighty keeps whomever He wills firm upon the religion, and makes crooked the heart of whomever He wills.'"