Aisha reported:

"The Prophet, peace and blessings be upon him, would seek spiritual retreat in the mosque during the last ten nights of Ramadan, until Allah Almighty caused him to pass away. His wives continued to perform the retreat after him."

This narration establishes the practice of I'tikaf (spiritual retreat) as a lifelong commitment of the Prophet ﷺ. By spending the final ten nights in the mosque, he created a space entirely dedicated to worship, away from worldly distractions, specifically to seek the Night of Decree.