With this same chain, the Messenger of Allah (peace be upon him) said: "When any one of you performs an obligatory prayer and does not complete its bowing, prostration, takbir, and humility, then he is like a merchant whose wealth does not increase, to the extent that even his principal amount is not fulfilled."
Hadith Referenceمسند اسحاق بن راهويه / كتاب الصلوٰة / 173