The recommended du'a to recite when leaving a gathering is: "Kaffaratul Majlis" (the expiation of assembly). It is recited in Arabic as "Subhanak Allāhumma wa bi hamdika, ash-hadu 'an lā ilāha illā Anta, astaghfiruka wa atūbu ilayk". The translation is: "Glory be to You, O Allah, and praise is to You. I bear witness that there is none worthy of worship but You. I seek Your forgiveness and repent to You

This du'a is a tradition based on narrations from the Prophet Muhammad (peace be upon him), where he would recite it after every gathering or session. It is believed to help expiate any unintentional wrongdoing that might have occurred during the gathering