وَأَشْهُرُ الْحَجِّ: شَوَّالٌ، وَذُو الْقَعْدَةِ، وَعَشْرٌ مِنْ ذِي الْحِجَّةِ
Translation: The Hajj months are Shawwal, Dhu al-Qaʿdah, and the first ten days of Dhu al-Hijjah.
This calendar definition is essential for the preceding tawaf questions. Shawwal marks the start of the period in this discussion. “Ten days of Dhu al-Hijjah” must not be expanded to the whole month.