Al–Aghar al–Muzani (رضي الله عنه) reported:

The Messenger of Allah (ﷺ) said, “Verily, there is (at times) some sort of shade upon my heart, and I seek forgiveness from Allah a hundred times a day.”

— Sahih Muslim (2702a)

Al–Qadi (رحمه اللّٰه) said:

“It is said that this means the Prophet (ﷺ) experienced intervals of distraction from the remembrance of Allah, as remembrance was his normal state of affairs. When he (ﷺ) experienced a period of inattention or unmindfulness, he would consider it sinful and seek forgiveness for it.”

End quote from Sharh al-Nawawī ‘ala Sahih Muslim 17/23.

May Allah ﷻ forgive us. 

Aameen!