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What to say while sitting in an assembly
Ibn Umar (RA) said:
Allah's Messenger (SAW) used to repeat in a single sitting:
رَبِّ
اغْفِـرْ لي، وَتُبْ عَلَـيَّ، إِنَّكَ أَنْـتَ التَّـوّابُ الغَـفُورُ
195. Rabbighfir lee wa tub 'alayya 'innaka 'Antat-Tawwaabul-Ghafoor.
My
Lord, forgive me and accept my repentance, You are the Ever-Relenting,
the All-Forgiving.
Reference: Sahih Ibn
Majah 2/321. See also Al-Albani, Sahih At-Tirmithi 3/153.