the Messenger of Allah granted a concession to some camel herders, allowing them to not stay overnight in Mina, and allowing them to stone the Jimar on the Day of Sacrifice, then to combine the stoning of two days after sacrifice, so that they could do it on one of the two days.
أَنَّ رَسُولَ اللَّهِ ﷺ رَخَّصَ لِلرُّعَاةِ فِي الْبَيْتُوتَةِ يَرْمُونَ يَوْمَ النَّحْرِ وَالْيَوْمَيْنِ اللَّذَيْنِ بَعْدَهُ يَجْمَعُونَهُمَا فِي أَحَدِهِمَا
the Messenger of Allah granted a concession to some camel herders, allowing them to not stay overnight in Mina, and allowing them to stone the Jimar on the Day of Sacrifice, then to combine the stoning of two days after sacrifice, so that they could do it on one of the two days. (Using translation from Nasāʾī 3069)
أَنَّ رَسُولَ اللهِ ﷺ «رَخَّصَ لِلرِّعَاءِ في الْبَيْتُوتَةِ يَرْمُونَ يَوْمَ النَّحْرِ وَالْيَوْمَيْنِ اللَّذَيْنِ بَعْدَهُ يَجْمَعُونَهُمَا فِي أَحَدِهِمَا»