دُعَاءُ الْخُرُوجِ مِنَ الْمَسْجِد
Duʿāʾ al-Khurūj mina al-Masjid — When Leaving the Mosque
اللَّهُمَّ إِنِّي أَسْأَلُكَ مِنْ فَضْلِكَ
Allāhumma innī asʾaluka min faḍlika.
O Allah, I ask You of Your bounty.
Abū Usayd reported: The Messenger of Allah ﷺ said: When one of you enters the mosque, let him say, 'O Allah, open for me the gates of Your mercy.' And when he leaves, let him say, 'O Allah, I ask You of Your bounty.'
Source: Ṣaḥīḥ Muslim 713