Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) passed by a man who was lying on his stomach (face down). The Prophet (peace and blessings be upon him) nudged him with his foot and said: This is a way of lying down which Allah Almighty does not like.
Hadith Referenceصحیح ابن حبان / كتاب الزينة والتطييب / 5549
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيحسن صحيح - «المشكاة» (4718).فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده حسن