It is narrated from Wa'il bin Hujr (may Allah be pleased with him) that when the Prophet (peace and blessings be upon him) prostrated, his knees would rest on the ground before his hands, and when he rose, he would raise his hands before his knees.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2628