Maliks Muwatta Book 3, Hadith Number 17.
Section : The Opening of the Prayer.
Yahya related to me from Malik from Ibn Shihab from Salim ibn Abdullah from Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and grant him peace, used to raise his hands to the level of his shoulders when he began the prayer and when he raised his head from the ruku he raised them in the same way, saying, “Allah hears whoever praises him, our Lord and praise belongs to You.” He did not raise them in the sujud.