He saw the Prophet ﷺ raise his hands with the takbir and place his right hand over his left during the prayer.
حدثنا وكيع عن المسعودي
أنه رأى النبي ﷺ يرفع يديه مع التكبيرة ويضع يمينه على يساره في الصلاة
Its isnad is sahih. It was previously mentioned at 18752.