Fatimah radiallahu anho narrated:
"When Allah's Messenger peace be upon him entered the Masjid he said Salat and Salam upon Muhammad and then said: (Rabbighfirli dhunubi, waftahli abwaba rahmatik) 'O pardon my sins, and open the gates of Your mercy for me.' And when he exited he said Salat and Salam upon Muhammad, and then said: (Rabbighfirli dhunubi, waftahli abwaba fadlik) 'O Lord pardon my sins, and open the gates of Your blessings for me.'"