Chapter on I'tikaf (spiritual Retreat)
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 2|Chapter 38
وَ رَوَى أَبُو أَيُّوبَ عَنْ أَبِي عُبَيْدَةَ عَنْ أَبِي جَعْفَرٍ عَلَيْهِ اَلسَّلاَمُ قَالَ: «اَلْمُعْتَكِفُ لاَ يَشَمُّ اَلطِّيبَ وَ لاَ يَتَلَذَّذُ بِالرَّيْحَانِ وَ لاَ يُمَارِي وَ لاَ يَشْتَرِي وَ لاَ يَبِيعُ» قَالَ «وَ مَنِ اِعْتَكَفَ ثَلاَثَةَ أَيَّامٍ فَهُوَ يَوْمَ اَلرَّابِعِ بِالْخِيَارِ إِنْ شَاءَ زَادَ ثَلاَثَةً أُخْرَى وَ إِنْ شَاءَ خَرَجَ مِنَ اَلْمَسْجِدِ فَإِنْ أَقَامَ يَوْمَيْنِ بَعْدَ اَلثَّلاَثَةِ فَلاَ يَخْرُجْ مِنَ اَلْمَسْجِدِ حَتَّى يُتِمَّ ثَلاَثَةَ أَيَّامٍ أُخَرَ ».
It is narrated by Abu Ayyub, from Abu Ubaydah, from Abu Ja'far عليه السلام, who said: "The one performing i'tikaf must not smell perfume, enjoy fragrant plants, engage in argumentation, buy, or sell." Imam عليه السلام further said: "Whoever performs i'tikaf for three days has the option on the fourth day: if they wish, they may continue for another three days, or if they wish, they may leave the mosque. However, if they stay for two days after the initial three, they must complete another three days and not leave the mosque until they have done so."
- Ṣaḥīḥ al-Faqīh, p. 112