It is narrated from Hazrat Bara’ (may Allah be pleased with him) that he saw the Noble Prophet (peace and blessings be upon him) raising his hands at the time of commencing the prayer.
Hadith Referenceمسند احمد / أول مسند الكوفيين / 18692
Hadith Gradingحکم دارالسلام:إسناده ضعيف لضعف يزيد بن أبى زياد