Sunan an-Nasa'i 890
سنن النسائي#890SahihIt was narrated from Abu Hurairah that:The Prophet (ﷺ) forbade praying with one's hands on one's waist
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 11:15