And Imaam Bukhaaree said in {juz rafa' al-yadain}, "and it is related from Abu Bakr bin Ayaash from Husain from Mujahid that he did not see ibn Umar raise his hands except at the first takbeer. And it is related from the people of Knowledge that it is not preserved from ibn Umar except as negligence. Do you not see that ibn Umar used to throw pebbles at the one who did not raise his hands (at ruku') in prayer? So how could ibn Umar leave something that he commanded others to do and he saw the Prophet doing? Imaam Bukhaaree said, Yahya bin Ma'een said, 'the hadeeth of Abu Bakr from Husain is a vain fancy of his having no basis."

And Imaam al-Bayhaqi said in {al-Ma'rifah},

'this hadeeth of Abu Bakr bin Ayash was related to us from Abu Abdullaah al-Haafidh, [and he mentioned it with this sanad. Then he narrated] from Bukhaaree that he said, "Abu Bakr bin Ayaash got confused at the end of his life," and the narration is related from Rabee', al-Laith, Tawoos, Saalim, Abu Zubair, Muhaarib bin Dithaar, and others saying, "we saw ibn Umar raise his hands when he made takbeer (for ruku) and when he raised (his head from ruku)." And it is related from Abu Bakr from Husain from Ibraaheem from ibn Mas'ud of old as a mursal mawqoof narration, "that ibn Mas'ud used to raise his hands when he started prayer, and then he did not raise them afterwards." And this is what is preserved from Abu Bakr bin Ayaash, and the first is a bad error due to it contradicting the trustworthy narrations from ibn Umar. al-Haakim said,"Abu Bakr bin Ayaash used to be from the fixed memorisers, then he got confused when his memorisation went bad, and he related that which had contradictions in it." So how is the claim of abrogating the hadeeth of ibn Umar permissible with the likes of this weak hadeeth, or that we say that 'he left it one time to show it's permissiblity as he did not say it was obligatory, for his action is evidence that it is sunnah, and his leaving it is evidence that it is not obligatory.'?' [End, as is found in {Nasb ar-Raayah}]

al-Haafidh ibn Hajr said in {Fathul Baaree},

'and as for the Hanafiyyah then they rely upon the narration of Mujaahid that he prayed behind ibn Umar and he did not see him raise his hands (before and after ruku). And they (ie scholars of hadeeth) replied by defaming it's isnaad, for it's narrator is Abu Bakr bin Ayaash and his memorisation went bad at the end of his life. And if it is authentic than the action (of raising) is established from Saalim, Naafi and others, and the larger number take precedence over the one, especially that their (narration) is affirmatory and his negatory. And that a reconciliation is possible, and that is that ibn Umar did not consider it obligatory. So he did it sometimes and left it at other times' [End]

al-Faadil al-Luknawee said in his ta'leeq upon al-Muwatta of Muhammad, 'it is well known in the books of Usul of our companions (i.e. Hanafees), "that Mujaahid said, 'I accompanied ibn Umar for ten years and I did not see him raise his hands except once.'" They said, "and ibn Umar relates the raising of hands (at ruku) from the Messenger and he himself left it. And a Companion who narrates a hadeeth, then he leaves what is narrated (which is) clear in meaning and it is not possible to explain it, then you leave depending upon what is narrated." And at-Tahaawee relates from the hadeeth of Abu Bakr bin Ayaash from Husain from Mujahid that he said, "I prayed behind ibn Umar and he did not use to raise his hands except at the first takbeer of prayer." Then he said, "so this was ibn Umar who saw the Prophet raise his hands, then he left that same raising after the Prophet and he did not do that except that abrogation was established with him." And here arises some points of discussion:

First: investigating the isnaad of what they transmit from Mujaahid that he accompanied ibn Umar for ten years and did not see him raise his hands except at the first takbeer.