Al-Kāfi - The Book of Fasting

Chapter: Minimum Limits of I‘tikaf َحْبُوبٍ عَنْ أَبِي أَيُّوبَ عَنْ ٠ٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلاَ٠) قَالَ إِذَا اعْتَكَفَ يَوْ٠ْ يَكُنِ اشْتَرَطَ فَلَهُ أَنْ يَخْرُجَ وَيَفْسَخَ الاعْتِكَافَ وَإِنْ أَقَا٠ْ يَكُنِ اشْتَرَطَ فَلَيْسَ لَهُ أَنْ يَفْسَخَ اعْتِكَافَهُ حَتَّى يَ٠ْضِيَ ثَلاثَةُ أَيَّا٠3.

Ahmad ibn Muhammad from has narrated from ibn Mahbub from abu Ayyub from Muhammad ibn Muslim who has said the following: “Abu Ja‘far (a.s.), has said, ‘If one remains in Ttikaf for one day without setting a condition, he can leave and depart the ’ Ttikaf but if one remains in ’Ttikaf for two days without condition being set, he then cannot leave out the ’Ttikaf; until three days are complete.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (6/432))