عَنْ أَبِي هُرَيْرَةَ رضى الله عنه
قَالَ: «نَهَى رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: أَنْ يُصَلِّيَ اَلرَّجُلُ مُخْتَصِرًا» مُتَّفَقٌ عَلَيْهِ، وَاللَّفْظُ لِمُسْلِمٍ. 1 وَمَعْنَاهُ: أَنْ يَجْعَلَ يَدَهُ عَلَى خَاصِرَتِهِ 21 صحيح
The Messenger of Allah (sallallahu alayhi wa sallam) forbade keeping one’s hands on one’s waist while praying. The wording is that of Muslim’s. And it’s meaning is to put (one’s) hands on his waist.
Bulugh al-Maram 282, Book 2, The Book of Prayer, Hadith 103. 1 min read