It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that I saw the Prophet (peace and blessings be upon him) standing in the plain of Arafat, supplicating in such a manner that he had raised his hands in front of his chest and the backs of his palms were facing the ground.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11103
Hadith Gradingحکم دارالسلام:إسناده ضعيف لضعف بشر بن حرب الأزدي .