Musannaf Ibn Abi Shaybah 31300 — The supplication on rising

Amr bin Dinar said that Ubayd bin Umayr said: We used to regard as the oft-returning, vigilant one (al-awwab al-hafiz) the person who, when he rose from his gathering, would say this supplication: "O Allah, forgive me for the things I have done in this gathering of mine."