Supplications of Kaffārah al-Majlis
In the name of Allāh, the Most Gracious, the Most Merciful;
All the praise and Thanks are due to Allāh, the Lord of al-ā’lamīn. I testify that there is none worthy of worship except Allāh, and that Muhammad, sallallāhu alayhi wa sallam, is His Messenger.
The following two supplications are recited after a gathering ( Majlis).
The Prophet (sallallāhu ‘alaihi wa sallam) said, “No people sit in a gathering in which they do not mention Allāh, nor send prayers on the Prophet, without it being a source of regret for them; if Allāh wishes, He will punish them, or if He wishes, he will forgive them" – [Narrated by at-Tirmidzi, Hākim and Ahmad: Sahih]
The first supplication is the fullest form of the du`ā' known as Kaffārah al-Majlis (Expiation of the Gathering), “Subhānallāhi wabihamdih. Subhānakallāhumma wabihamdika, Ash-hadu and lā ilāha ill-Allāh illa anta. Astaghfiruka waatubuilaik.” (Glorified be Allāh, and Praised. Glorified be You, O Allāh, and Praised. I bear witness that there is no true god except you. I seek forgiveness from you and repent to you.) The Prophet (sallallāhu ‘alaihi wa sallam), "He who says it in a gathering of Remembrance (of Allāh), it will be like a seal to stamp it with, and he who says it in a gathering of vain talk, it will be expiation for it" – [Narrated by Hākim and Tabarāni: Sahih.].
The second supplication is, of course, from the Sunnah of sending peace and mercy on the Messenger (sallallāhu ‘alaihi wa sallam).
“Allāhumma salli `ala Muhammad, wa `ala āli Muhammad kamā sallayta `ala āli Ibrāhīm, wa bārik ‘ala Muhammad, wa `ala āli Muhammad kama bārakta `ala āli Ibrāhīm, fil-‘ālamīn; Innaka Hamīdun Majīd”
(0 Allah! Send Prayers upon Muhammad and the members of his household as you’ve Sent Prayers upon the members of Ibrahim's household. And Send Blessings to Muhammad and the members of his household as You Granted Blessings upon the members of the household of Ibrahim, among all the nations’ Verily You are Most Praiseworthy, Full of Glory)”, [Muslim, (803)]