He saw a man who was not completing his bowing or his prostration. When the man finished his prayer, Hudhayfah said to him, "You have not prayed."I think he also said, "If you were to die in this state, you would die upon something other than the way of Muhammad ﷺ."
أخبرنا الصلت بن محمد أخبرنا مهدي عن واصل عن أبي وائل
رأى رجلا لا يتم ركوعه ولا سجوده فلما قضى صلاته قال له حذيفة ما صليت قال وأحسبه قال لو مت مت على غير سنة محمد ﷺ