The Prophet ﷺ said, "The worst thief among people is the one who steals from his prayer."They asked, "Messenger of Allah, how does a person steal from his prayer?"He replied, "He does not complete its ruku or its sujud." Or he said, "He does not straighten his back in ruku and sujud."
حدثنا الحكم بن موسى حدثنا الوليد بن مسلم عن الأوزاعي عن يحيى بن أبي كثير عن عبد الله بن أبي قتادة عن أبيه عن النبي ﷺ نحوه