كتاب التطبيق
Read the English translation first, with the original Arabic directly underneath.
It was narrated from Ibn 'Umar in a Marfu' report that:
The hands prostrate as the face prostrates, so when one of you puts his face down he should put his hands down, and when he raises (the face) he should raise (the hands) too.
إِنَّ الْيَدَيْنِ تَسْجُدَانِ كَمَا يَسْجُدُ الْوَجْهُ فَإِذَا وَضَعَ أَحَدُكُمْ وَجْهَهُ فَلْيَضَعْ يَدَيْهِ وَإِذَا رَفَعَهُ فَلْيَرْفَعْهُمَا