"The Prophet permitted the shepherds to stone a day and leave a day."  

أَنَّ النَّبِيَّ ﷺ أَرْخَصَ لِلرِّعَاءِ أَنْ يَرْمُوا يَوْمًا وَيَدَعُوا يَوْمًا  

"The Messenger of Allah permitted the camel herders who were in the camp (at Mina) to stone on the Day of An-Nahr then to gather the stoning of two days after the Day of An-Nahr, so that they stoned them during one of them." Malik said: "I think that he said about the first of them: 'They they should stone on the day of departure.'"  

رَخَّصَ رَسُولُ اللَّهِ ﷺ لِرِعَاءِ الإِبِلِ فِي الْبَيْتُوتَةِ أَنْ يَرْمُوا يَوْمَ النَّحْرِ ثُمَّ يَجْمَعُوا رَمْىَ يَوْمَيْنِ بَعْدَ يَوْمِ النَّحْرِ فَيَرْمُونَهُ فِي أَحَدِهِمَا قَالَ مَالِكٌ ظَنَنْتُ أَنَّهُ قَالَ فِي الأَوَّلِ مِنْهُمَا ثُمَّ يَرْمُونَ يَوْمَ النَّفْرِ