Abu Qilabah reported that he saw Malik bin Huwayrith raise his hands when he began the prayer with the takbir, raise his hands again when he intended to bow, and raise his hands once more when he lifted his head from bowing. Malik bin Huwayrith narrated that the Messenger of Allah ﷺ used to do the same.
أنه رأى مالك بن الحويرث إذا صلى كبر، ورفع يديه، وإذا أراد أن يركع رفع يديه، وإذا رفع رأسه من الركوع رفع يديه، وحدث أن رسول الله ﷺ صنع هكذا.
Bukhari narrated it in the chapter on adhan (737), and Muslim in the chapter on prayer (391), both through Khalid bin Abdullah, from Khalid Hadhdha, from Abu Qilaba, who mentioned something similar.Muslim also narrated it in the chapter on prayer through Abu Awana, from Qatada, from Nasr bin Asim, from Malik bin Huwayrith, that the Messenger of Allah ﷺ would raise his hands when he said the takbir until they were level with his ears, and when he bowed for ruku he would raise his hands until they were level with his ears, and when he raised his head from ruku he would say, "Allah hears whoever praises Him," and would do the same again.He also narrated it through Saeed, from Qatada with this same chain, that he saw the Prophet of Allah ﷺ, and he said, "until they were level with the tops of his ears."Bukhari also narrated it (631) through Abdul-Wahhab, who said, Ayub told us, from Abu Qilaba, who said, Malik told us, "We came to the Prophet ﷺ as young men close in age, and we stayed with him for twenty days and nights. The Messenger of Allah ﷺ was merciful and gentle, and when he sensed that we longed for our families, or that we missed them, he asked us about those we had left behind, and we told him. He said, 'Go back to your families, stay among them, and teach them, and command them,'" and he mentioned things, some of which I remember and some of which I do not, "and pray as you have seen me pray..."Ibn Khuzayma said in his Sahih (586), after narrating it through Abdul-Wahhab Thaqafi with this chain, "The Prophet ﷺ commanded Malik bin Huwayrith and the young men who were with him to pray as they had seen the Prophet ﷺ pray. Malik bin Huwayrith informed us that the Prophet ﷺ used to raise his hands when he said the takbir in prayer, when he bowed for ruku, and when he raised his head from ruku. This indicates that the Prophet ﷺ commanded the raising of the hands when the worshiper intends to bow for ruku, and when he raises his head from ruku."As for what appears in Musnad Ahmad (15600) and Nasai (1085, 1086) through Muhammad bin Adi, from Shuba according to Nasai's version, this is an error, and the correct version is from Saeed, who is Ibn Abu Aruba, as appears in the second version reported by Nasai, and likewise in Ahmad's version, as the editors of Musnad Ahmad (34/159) verified, so refer to it, from Qatada, from Nasr bin Asim, from Malik bin Huwayrith. It adds, "And when he prostrated for sujud, and raised his head from his sujud, until they were level with the tops of his ears." Hisham Dastawai likewise added this, from Qatada with his chain, and it states, "And when he raised his head from sujud, he did the same." Nasai recorded it.Nasai titled a chapter on this, "Chapter on Raising the Hands for Sujud," and mentioned this hadith in it, but followed it with a chapter after it titled, "Chapter on Not Raising the Hands for Sujud," thereby making not raising the hands for sujud the later of the two practices, and he mentioned in it the hadith of Ibn Umar, "He did not do that during sujud." He has another chapter titled, "Chapter on Raising the Hands When Rising from the First Sajdah," in which he included the hadith of Hisham from Qatada. He then followed it with a chapter after it titled, "Chapter on Not Doing That Between the Two Sajdahs," in which he mentioned the same hadith of Ibn Umar referred to earlier.However, this addition in Hisham's version was not mentioned by Ibn Majah (859) nor by Ahmad (20535), even though both of them also narrated it from Hisham Dastawai. So we must either say that this addition is shadhdh, contradicting the narration of the group, or say that perhaps the Prophet ﷺ did that on some occasions, though it was not his regular practice, given Abdullah bin Umar's denial of it, and he was among the people most keen to follow the Prophet's ﷺ actions.This is supported by what Bukhari said in Juz Raf Yadayn (98), "As for the one who says that the Prophet ﷺ used to raise his hands at ruku and when he raised his head from ruku, and what Abu Humayd added beyond that, among ten of the Prophet's ﷺ companions, that he used to raise his hands when standing up from the two sajdahs, all of it is sahih, because they were not describing one single prayer such that they would differ regarding that specific prayer. Indeed there is no real disagreement in this, it is simply that some of them added to what others reported, and such an addition is accepted by the scholars of knowledge."Likewise, Hafiz bin Rajab said in Fath al-Bari (4/326), "The response to all these narrations, assuming that the mention of raising the hands in them is correctly preserved and was not confused with the mention of the takbir accompanying the raising, is that Malik bin Huwayrith and Waail bin Hajar were not from the people of Madinah, but had only come to it once or twice. So perhaps the two of them saw the Prophet ﷺ do that on one occasion, and this is contradicted by Ibn Umar's denial of it, given his close and constant companionship of the Prophet ﷺ and his great keenness to preserve his actions and follow his example in them. This indicates that, for the most part, the Prophet's ﷺ practice was to not raise the hands, except in the three places, and when rising after every two rak'ahs. Narrations have been reported about raising the hands at sujud and elsewhere, but they are flawed narrations."