DARIMI 1820:
from Abū Hurayrah —
[Machine] The translation of the given Arabic text into English is: "The Messenger of Allah ﷺ used to observe I'tikaf during the last ten days (of Ramadan), but when it was the year in which he passed away, he observed I'tikaf for twenty days."
الدارمي ١٨٢٠:
عن ابو هريره —
«كَانَ رَسُولُ اللَّهِ ﷺ يَعْتَكِفُ الْعَشْرَ الْأَوَاخِرَ فَلَمَّا كَانَ الْعَامُ الَّذِي قُبِضَ فِيهِ اعْتَكَفَ عِشْرِينَ يَوْمًا»