The Command To Perform The Prayer Properly, To Complete It, And To Have Khushu' In It Sahih Muslim 425 a

Sahih Muslim 425a
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Translation
Anas b. Malik reported. The Messenger of Allah (ﷺ) 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.