It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "When one of you prostrates, he should place his two hands (on the ground), and when he rises, he should raise them; for the hands prostrate just as the face does."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2644