Invocation
For the expiation of sins, said at the conclusion of a sitting or gathering
سُبْحـانَكَ اللّهُـمَّ وَبِحَمدِك، أَشْهَـدُ أَنْ لا إِلهَ إِلاّ أَنْتَ أَسْتَغْفِرُكَ وَأَتوبُ إِلَـيْك
Glory is 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.
Abu Dawud, Ibn Majah, At-Tirmidhi and An-Nasa'i. See also Al-Albani, Sahih
At-Tirmidhi 3/ 153. Aishah (RA) said: "Allah's Messenger (ﷺ) did not sit
in a gathering, and did not recite the Qur'an, and did not perform any
prayer without concluding by saying ... (then she quoted the above)." This
was reported by An-Nasa'i in 'Amalul-Yawm wal-Laylah (no.308), and Dr.
Farooq Hamadah graded it authentic in his checking of the same book, p.
273. See also Ahmad 6/77