مسند اسحاق بن راهويه
Musnad Ishaq Bin Rahwiya
كتاب الصلوٰة
Book of Prayer
Prayer is invalidated by incomplete bowing and prostration
Hadith Number: 173
وبهذا، عن رسول الله صلى الله عليه وسلم قال: ((إذا صلى احدكم المكتوبة فلم يتم ركوعها وسجودها وتكبيرها والتضرع فيها كان كمثل التاجر لا يشف له حتى بقي راس المال)).
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."
