Nafi' narrates from Ibn Umar (may Allah be pleased with him) that when he started the prayer, he would raise his hands up to his shoulders, and when he raised his head from bowing (ruku'), he would raise both hands a little less than that.
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 194
Hadith Takhrijأخرجہ البخاری، الاذان، باب رفع الیدین اذا قام من الرکعتین: 739۔