Abdullah bin Umar reported,

When the Messenger of Allah ﷺ began the prayer, he would raise his hands to the level of his shoulders, and when he raised his head from the bowing, he would raise them in the same way, saying, "Allah hears whoever praises Him. Our Lord, to You belongs all praise." He did not do this when prostrating.

Azami 1938

Sahih

عن ابن عمر قال

إن رسول الله ﷺ كان إذا افتتح الصلاة رفع يديه حذو منكبيه، وإذا رفع رأسه من الركوع رفعهما كذلك أيضا وقال: سمع الله لمن حمده ربنا ولك الحمد، وكان لا يفعل ذلك السجود.

الأعظمي 1938صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Prayer
Chapter
Description of prayer, the takbir, standing, and recitation
Section
Raising the hands at ruku and when raising the head from it
Numbering
Jami al-Kamil 1938 (2nd edition)
Azami 1938