Raising the hands when bowing (Rukū) and rising from bowing

بسم الله الرحمن الرحيم

Imām al-Bukhārī:
باب رَفْعِ الْيَدَيْنِ إِذَا كَبَّرَ وَإِذَا رَكَعَ وَإِذَا رَفَعَ

Chapter: To raise both hands upon saying the (opening) Takbir, and when performing Rukū’ (bowing) and on rising from it (i.e. Rukū’):

Ibn ‘Umar narrated: I saw that whenever Allāh’s Messenger (ﷺ) stood for the prayer, he used to raise both his hands up to the shoulders, and used to do the same on saying the Takbīr for Rukū’ (bowing) and on raising his head from Rukū’… (Sahīh al-Bukhārī 736)

Abū Zubair narrated that Jābir ibn ‘Abdullāh would raise his hands when he began the prayer, and when he made Rukū’, and when he raised his head from Rukū’ he would do likewise, and he said: “I saw the Messenger of Allāh (ﷺ) doing the same.” (Ibn Mājah 868. Declared Sahīh by Al-Albānī)

Ibn ‘Abdul-Barr said: Dawūd ibn ‘Alī said: Raising the hands at the opening Takbīr is obligatory and one of the pillars of prayer. Some of the people of knowledge said: The raising (of the hands) upon the opening (takbīr) and upon Rukū’, and rising from Rukū’ is obligatory, based on his (ﷺ) statement, “Pray as you have seen me pray.”(Sahīh al-Bukhārī 631). (At-Tamhīd 6/345)

Nāfī’ narrated that if Ibn ‘Umar saw a man who did not raise his hands when making Rukū’, and upon rising from it, he would throw pebbles at him. (Kitāb Raf’ al-Yadayn of al-Bukhārī pg. 53)

Abū Hamzah narrated: I saw Ibn ‘Abbās raise his hands when he performed Rukū’, and when he raised his head from Rukū’.  (At-Tamhīd 6/350)

al-Hasan (al-Basrī) said: The Companions of the Messenger of Allāh (ﷺ), would raise their hands in prayer, when they made rukū, and when they rose from it. (At-Tamhīd 6/350)

Al-Bukhārī said: al-Hasan did not exclude anyone from the companions of the Prophet (ﷺ), and it has not been proven with the people of knowledge that any one among the companions did not raise his hands. (Kitāb Raf’ al-Yadayn pg. 31)

Hishām narrated upon al-Hasan and Muhammad Ibn Sirīn that they would raise their hands when they said Takbīr, when they made Rukū’, and when they rose (from Rukū’). Muhammad bin Sirīn said: It is part of the completion of the prayer (At-Tamhīd 6/351)

Rabī ibn Subayh narrated: I saw ‘Atā, Tawūs, Mujāhid, Al-Hasan, Ibn Sirīn, Nafī’, Ibn Abī Najīh, Hasan ibn Muslim, and Qatādah raising their hands when making Rukū and upon rising from it. (At-Tamhīd 6/351)