It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that he said: "I heard the Messenger of Allah (peace and blessings be upon him) saying: 'The expiation for a gathering is that the servant says after he rises (from the gathering): "Subhanaka Allahumma wa bihamdika, la ilaha illa anta, astaghfiruka wa atubu ilayk" (Glory be to You, O Allah, and with Your praise; there is no god worthy of worship but You; I seek Your forgiveness and I turn to You in repentance).'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Ata' (may Allah have mercy on him) except Ubayd and al-Nadr bin Kathir (may Allah have mercy on them both)."
Hadith Referenceالمعجم الأوسط / باب الألف / 1227
Hadith Gradingمحدثین:إسناده ضعيف لاختلاط عطاء بن السائب
Hadith Takhrij«قال الهيثمي: وفيهما عطاء بن السائب وقد اختلط «مجمع الزوائد ومنبع الفوائد، ج 10، ص 141»» «أخرجه الطبراني فى «الكبير» برقم: 10333»