When the Messenger of Allah ﷺ sat during the prayer and made supplication, he would place his right hand on his thigh and point with his finger.
حدثنا جرير عن منصور عن راشد أبي سعد
كان رسول الله ﷺ إذا جلس في الصلاة فدعا وضع يده اليمنى على فخذه ثم كان يشير بأصبعه
Its isnad is sahih. Rashid bin Muqrai Himsi is trustworthy, and in [Talaeeh] it appears as "Rashid Abu Saad," which is an error. The hadith has already appeared at 15304.