I saw the Messenger of Allah ﷺ, when he began the prayer with the takbir, raise his hands as he said the takbir until they were level with his shoulders. When he said the takbir for bowing, he did the same. Then when he said, "Allah hears whoever praises Him," he did the same and said, "Our Lord, to You belongs all praise." But he did not do this when he prostrated, nor when he raised his head from prostration.
أخبرنا عمرو بن منصور قال حدثنا علي بن عياش قال حدثنا شعيب عن الزهري قال حدثني سالم ح و أخبرني أحمد بن محمد بن المغيرة قال حدثنا عثمان هو ابن سعيد عن شعيب عن محمد وهو الزهري قال أخبرني سالم بن عبد الله بن عمر
رأيت رسول الله ﷺ إذا افتتح التكبير في الصلاة رفع يديه حين يكبر حتى يجعلهما حذو منكبيه وإذا كبر للركوع فعل مثل ذلك ثم إذا قال سمع الله لمن حمده فعل مثل ذلك وقال ربنا ولك الحمد ولا يفعل ذلك حين يسجد ولا حين يرفع رأسه من السجود
Bukhari narrated it in the Book of Adhan, chapter "How far should he raise his hands?", hadith no. 738, from the hadith of Shuayb bin Abu Hamza, and Muslim narrated it in the Book of Prayer, chapter "The recommendation of raising the hands level with the shoulders," etc., hadith no. 390, from the hadith of Zuhri, through him, and it is also in Al-Kubra, hadith no. 950 ...