I heard a man from Kindah say, "A man from the Ansar, one of the companions of the Prophet ﷺ, told me that he heard the Messenger of Allah ﷺ say, 'None of you falls short in any part of his prayer without Allah completing it from his voluntary prayers.'"
حدثنا يحيى بن إسحاق حدثنا ابن لهيعة عن يزيد بن أبي حبيب
سمعت رجلا من كندة يقول حدثني رجل من أصحاب النبي ﷺ من الأنصار أنه سمع رسول الله ﷺ يقول لا ينتقص أحدكم من صلاته شيئا إلا أتمها الله عز وجل من سبحته
No references are available.
Its chain of transmission is daif, due to the anonymity of the man from Kinda who narrated from the companion. Haythami said the same thing, 1/291, but this has already appeared earlier as part of a long hadith, and it is sahih.