Nafi' reports: Whenever Abdullah bin Umar (may Allah be pleased with them both) saw a person who did not raise his hands while bowing and rising during prayer, he would throw pebbles at him until he started raising his hands.
Hadith Referenceمسند الحميدي / 627
Hadith Gradingمحدثین:إسناده صحيح
Hadith Takhrij«إسناده صحيح وأخرجه الدارقطني فى «سننه» برقم: 1118، والبخاري فى الجز رفع اليدين»