‘Aishah (May Allah be pleased with her) reported:
Prior to his demise, the Messenger of Allah (ﷺ) used to supplicate frequently: Subhan Allahi wa bihamdihi, Astaghfirullaha wa atubu ilaihi (Allah is free from imperfection, and I begin with praising Him. I beg forgiveness from Allah and I turn to Him in repentance).”
[Al-Bukhari and Muslim].
Riyad as-Salihin 1877
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Watch this video from 0:00 – 2:50 for a short explanation of this hadith, and a connection to Surah Nasr.