It is narrated from Sayyiduna Irbadh bin Sariyah, may Allah be pleased with him, that the Prophet, peace and blessings be upon him, would seek forgiveness three times for those in the first row and once for those in the second row.
Hadith Referenceمسند احمد / مسند الشاميين / 17157
Hadith Gradingحکم دارالسلام:حديث صحيح، بقية بن الوليد يدلس ويسوي، لكنه متابع