He and a companion of his used to stay with Abu Raihanah to learn good things from him. He said: "One day my companion came and told me that he heard Abu Raihanah say: 'The Messenger of Allah [SAW] forbade filing (the teeth), tattoos, and plucking hairs.'" (Using translation from Nasāʾī 5110)
أَنَّهُ أَخْبَرَهُ أَنَّهُ كَانَ هُوَ وَصَاحِبٌ لَهُ يَلْزَمَانِ أَبَا رَيْحَانَةَ يَتَعَلَّمَانِ مِنْهُ خَيْرًا قَالَ «فَحَضَرَ صَاحِبِي يَوْمًا وَلَمْ أَحْضُرْ فَأَخْبَرَنِي صَاحِبِي أَنَّهُ سَمِعَ أَبَا رَيْحَانَةَ» يَقُولُ «إِنَّ رَسُولَ اللهِ ﷺ حَرَّمَ الْوَشْرَ وَالْوَشْمَ وَالنَّتْفَ»