In the beginning when Hajj was prescribed, people used to trade during Hajj. The narrator then narrated the rest of the tradition upto the words, ʿseason of Hajj’.
أَنَّ النَّاسَ فِي أَوَّلِ مَا كَانَ الْحَجُّ كَانُوا يَبِيعُونَ فَذَكَرَ مَعْنَاهُ إِلَى قَوْلِهِ مَوَاسِمِ الْحَجِّ