I saw the Messenger of Allah ﷺ, when he was standing in prayer, grasp his left hand with his right.
أخبرنا سويد بن نصر قال أنبأنا عبد الله عن موسى بن عمير العنبري وقيس بن سليم العنبري قالا حدثنا
رأيت رسول الله ﷺ إذا كان قائما في الصلاة قبض بيمينه على شماله
No references are available.
[Its chain of transmission is sahih] Ahmad narrated it: 316/4, from the hadith of Musa, through him, and it is in Kubra, hadith no. 961.