330. hadíth
وَ رَوَى اَلْحَسَنُ بْنُ مَحْبُوبٍ عَنْ أَبِي أَيُّوبَ عَنْ أَبِي بَصِيرٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ قَالَ: «لاَ يَكُونُ اَلاِعْتِكَافُ أَقَلَّ مِنْ ثَلاَثَةِ أَيَّامٍ وَ مَنِ اِعْتَكَفَ صَامَ وَ يَنْبَغِي لِلْمُعْتَكِفِ إِذَا اِعْتَكَفَ أَنْ يَشْتَرِطَ كَمَا يَشْتَرِطُ اَلَّذِي يُحْرِمُ ».
It is narrated by Al-Hasan ibn Mahbub, from Abu Ayyub, from Abu Basir, from Abu Abdullah (a.s), who said: "I'tikaf cannot be for less than three days. Whoever performs i'tikaf must fast, and it is appropriate for the one performing i'tikaf to make a stipulation, just as one who enters into ihram (for pilgrimage) makes a stipulation."