Hazrat Ash'ath says that Hasan used to do the same.

Ibn Aun says that Muhammad used to raise his hands when starting the prayer, when going into bowing, and when rising from bowing.

Hazrat Khalid narrates that Hazrat Abu Qilabah used to raise his hands while going into ruku and when rising from ruku.

Hazrat Muhammad bin Amr bin Ata says that I saw Hazrat Abu Humaid Sa’idi with ten companions of the Messenger (peace be upon him). He said, "Shall I not describe to you the way the Messenger of Allah (peace be upon him) performed prayer?" They said, "Certainly, do so." He said, "I saw the Messenger of Allah (peace be upon him) that when he began the prayer with the opening takbeer, he raised his hands; when he went into ruku, he raised his hands; when he lifted his head from ruku, he raised his hands. Then he stood for such a duration that every bone returned to its place, then he would go down for prostration saying the takbeer."

Hazrat Muharib bin Dithar narrates that I saw Hazrat Ibn Umar (may Allah be pleased with them) raising his hands while going into ruku and sujood. I asked him the reason for this, so he replied that the Holy Prophet (peace and blessings be upon him) used to raise his hands even when standing up after two rak'ahs.