Al-Kāfi - The Book of Fasting

Chapter: Minimum Limits of I‘tikaf ِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ أَحْ٠َّدٍ عَنْ دَاوُدَ بْنِ سِرْحَانَ قَالَ بَدَأَنِي أَبُو عَبْدِ الله (عَلَيْهِ السَّلاَ٠ِنْ غَيْرِ أَنْ أَسْأَلَهُ فَقَالَ الاعْتِكَافُ ثَلاثَةُ أَيَّا٠ٍ يَعْنِي السُّنَّةَ إِنْ شَاءَ الله. 5.

A number of our people have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad from Dawud ibn Sarhan who has said the following: “Abu ‘Abd Allah (a.s.), once initiated speaking without my asking anything, ‘’Ttikaf consists of three days, meaning, according to the Sunnah, by the will of Allah.’” ضعيف - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (16/433))