When he began the prayer, he would say the takbir and raise his hands. He would do the same when he bowed, when he said, "Allah hears whoever praises Him," and when he rose from the two rakahs, he would raise his hands. He attributed this to the Messenger of Allah ﷺ.
حدثنا نصر بن علي أخبرنا عبد الأعلى حدثنا عبيد الله عن نافع
أنه كان إذا دخل في الصلاة كبر ورفع يديه وإذا ركع وإذا قال سمع الله لمن حمده وإذا قام من الركعتين رفع يديه ويرفع ذلك إلى رسول الله ﷺ
Bukhari narrated it in the chapter on adhan, in the section on raising the hands when standing up from the two rakahs, hadith no. 739, from the hadith of Abdul-Ala bin Abdul-Ala through the same chain. Baghawi graded it sahih in Sharh al-Sunnah 3/21, and whatever some people have said in criticizing it does not amount to a defect that undermines it. Praise be to Allah.