Waail bin Hajar reported,

I saw the Messenger of Allah ﷺ raise his hands when he began the prayer, when he bowed, and when he raised his head from bowing. When he sat, he laid his left foot flat and kept his right foot upright. He placed his left hand on his left thigh and his right hand on his right thigh, joined his middle finger and thumb in a circle, and pointed with his index finger.

Nasai 1264

Sahih

أخبرنا قتيبة قال حدثنا سفيان عن عاصم بن كليب عن أبيه

عن وائل بن حجر قال

رأيت رسول الله ﷺ يرفع يديه إذا افتتح الصلاة وإذا ركع وإذا رفع رأسه من الركوع وإذا جلس أضجع اليسرى ونصب اليمنى ووضع يده اليسرى على فخذه اليسرى ويده اليمنى على فخذه اليمنى وعقد ثنتين الوسطى والإبهام وأشار

النسائي 1264صحيح
Contents
Reference
Commentary
Ayat
Collection
Sunan Nasai Sughra
Book
Forgetfulness
Chapter
Description of sitting in the rakat in which one concludes the prayer
Numbering
Darussalam 1264
Nasai 1264