The Sufficient (Vol 4) · Hadith 681 (#Ḥadīth #3)
Chapter 77 | I‘tikaf is not Valid without Fasting
3ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ حَمَّادٍ عَنِ الْحَلَبِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ لا اعْتِكَافَ إِلاَّ بِصَوْمٍ فِي الْمَسْجِدِ الْجَامِعِ.
3. Ali ibn Ibrahim has narrated from his father from ibn abu ‘ Umayr from Hammad from al-Halabiy who has said the following: “Abu ‘Abd Allah , has said, ‘There is no i'tikaaf except with fasting in the general Masjid.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).