"The Messenger of Allah [SAW] said: 'O Ruwaifi', you may live for a long time after me, so tell the people that whoever ties up his beard, or twists it, or hangs an amulet, or cleans himself (after relieving himself) with animal dung or bones, Muhammad has nothing to do with him.'" (Using translation from Nasāʾī 5067)  

أَنَّهُ سَمِعَ رُوَيْفِعَ بْنَ ثَابِتٍ يَقُولُ إِنَّ رَسُولَ اللهِ ﷺ قَالَ يَا رُوَيْفِعُ «لَعَلَّ الْحَيَاةَ سَتَطُولُ بِكَ بَعْدِي فَأَخْبِرِ النَّاسَ أَنَّهُ مَنْ عَقَدَ لِحْيَتَهُ أَوْ تَقَلَّدَ وِتْرًا أَوِ اسْتَنْجَى بِرَجِيعِ دَابَّةٍ أَوْ عَظْمٍ فَإِنَّ مُحَمَّدًا ﷺ بَرِيءٌ مِنْهُ»