that Messenger of Allah ﷺ said: "If anyone of you has seen the crescent of Dhū al-Ḥijjah and one of you want to offer a sacrifice ˹on the Day of Naḥr˺, then he should hold back ˹cutting˺ his hair and nails."
أَنَّ النَّبِيَّ ﷺ قَالَ: «إِذَا رَأَيْتُمْ هِلاَلَ ذِي الْحِجَّةِ وَأَرَادَ أَحَدُكُمْ أَنْ يُضَحِّيَ فَلْيُمْسِكْ عَنْ شَعْرِهِ وَأَظْفَارِهِ۔»