Musannaf Ibn Abi Shayba 21:120

Ishaq ibn Mansur narrated to us, from Huraym, from Abd al-Rahman ibn Ishaq, from Abu Kathir, the freed slave of Umm Salama, that Umm Salama, when she would wake up during the night, would say: "O Lord, forgive and have mercy, and guide to the most upright path."