1877 - وعن عائشة رضي الله عنها قالت : كان رسول الله صلى الله عليه و سلم يكثر أن يقول قبل موته : [ سبحان الله وبحمده أستغفر الله وأتوب إليه ] متفق عليه
1877. `Aishah (May Allah be pleased with her) reported: Prior to his demise, the Messenger of Allah (PBUH) 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].
Commentary: In general, asking of forgiveness all the time is necessary and commendable. But during the old age and the last days of one's life it is particularly very essential. In this way, the Sunnah of the Prophet (PBUH) would also be followed.