Sahih Muslim Book 4, Hadith Number 855.

Chapter : If something happens in prayers, men should glorify Allah and women should clap hands.

Anas b. Malik reported. The Messenger of Allah (may peace be upon him) said: Perform bowing and prostration well. By Allah, I see you even if you are behind me, or he said: (I see you) behind my back when you bow or prostrate.