Musnad Ahmad 1244
It was narrated that ‘Ali (رضي الله عنه) said:
The Messenger of Allah (ﷺ) said to me: `O ‘Ali, I love for you what I love for myself and l hate for you what I hate for myself. Do not recite Qur`an whilst bowing or whilst prostrating, do not pray with your hair twisted or braided and gathered up on the head, for that is the place where the Shaitan sits; do not sit like a dog between the two prostrations [putting the feet up and sitting on them]; do not play with the pebbles; do not lay your forearm along the ground; do not prompt the imam; do not wear gold rings; do not wear garments made from a blend of linen and silk, and do not ride on red saddle cloths.`
حَدَّثَنَا يَزِيدُ، أَنْبَأَنَا إِسْرَائِيلُ بْنُ يُونُسَ، حَدَّثَنَا أَبُو إِسْحَاقَ، عَنِ الْحَارِثِ، عَنْ عَلِيٍّ، رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ لِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَا عَلِيُّ إِنِّي أُحِبُّ لَكَ مَا أُحِبُّ لِنَفْسِي وَأَكْرَهُ لَكَ مَا أَكْرَهُ لِنَفْسِي لَا تَقْرَأْ وَأَنْتَ رَاكِعٌ وَلَا وَأَنْتَ سَاجِدٌ وَلَا تُصَلِّ وَأَنْتَ عَاقِصٌ شَعْرَكَ فَإِنَّهُ كِفْلُ الشَّيْطَانِ وَلَا تُقْعِ بَيْنَ السَّجْدَتَيْنِ وَلَا تَعْبَثْ بِالْحَصَى وَلَا تَفْتَرِشْ ذِرَاعَيْكَ وَلَا تَفْتَحْ عَلَى الْإِمَامِ وَلَا تَتَخَتَّمْ بِالذَّهَبِ وَلَا تَلْبَسْ الْقَسِّيَّ وَلَا تَرْكَبْ عَلَى الْمَيَاثِرِ‏.‏