« « اَلْحَجُّ أَشْهُرٌ مَعْلُومٰاتٌ » ، - شَوَّالٌ وَ ذُو اَلْقَعْدَةِ وَ ذُو اَلْحِجَّةِ وَ مَنْ أَرَادَ اَلْحَجَّ وَفَّرَ شَعْرَهُ إِذَا نَظَرَ إِلَى هِلاَلِ ذِي اَلْقَعْدَةِ وَ مَنْ أَرَادَ اَلْعُمْرَةَ وَفَّرَ شَعْرَهُ شَهْراً».
"The Hajj is in well-known months" (Surah Al-Baqarah 2:197)—Shawwal, Dhu al-Qa‘dah, and Dhu al-Hijjah. Whoever intends to perform Hajj should let their hair grow from the sighting of the crescent of Dhu al-Qa‘dah. Whoever intends to perform ‘Umrah should let their hair grow for a month."