'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].

وعن عائشة رضي الله عنها قالت: كان رسول الله ﷺ يكثر أن يقول قبل موته
"سبحان الله وبحمده، أستغفر الله، وأتوب إليه" ((متفق عليه)).