When Abdullah bin Umar began the prayer, he would raise his hands level with his shoulders, and when he raised his head from ruku, he would raise them lower than that.
و حدثني يحيى عن مالك
أن عبد الله بن عمر كان إذا افتتح الصلاة رفع يديه حذو منكبيه وإذا رفع رأسه من الركوع رفعهما دون ذلك