Mishkat al-Masabih 4 Prayer كتاب الصلاة 516

وَعَنِ ابْنِ عَبَّاسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «خِيَارُكُمْ أَلْيَنُكُمْ مَنَاكِبَ فِي الصَّلَاة» . رَوَاهُ أَبُو دَاوُد

Ibn ‘Abbas reported God’s Messenger as saying, ‘‘The best of you are those whose shoulders give least annoyance in prayer.” Abu Dawud transmitted it.