Musannaf Ibn Abi Shaybah 32425 — Book of Faith

Shahr bin Hawshab (may Allah have mercy on him) said: I asked Umm al-Mu'minin Sayyidah Umm Salamah (may Allah be pleased with her): "When the Messenger of Allah (peace and blessings be upon him) was with you, which supplication did he (peace and blessings be upon him) make most often?" The narrator said: She (may Allah be pleased with her) said: "He (peace and blessings be upon him) most often made this supplication: 'O Turner of hearts, make my heart firm upon Your religion.' I said: 'O Messenger of Allah (peace and blessings be upon him)! This is mostly your (peace and blessings be upon him) supplication: O Turner of hearts, make my heart firm upon Your religion.' He (peace and blessings be upon him) said: 'O Umm Salamah! There is no person except that his heart is between two of the fingers of Allah. Whomever He wills He sets straight, and whomever He wills He makes crooked.'"