It wasnarrated that 'Abdullah said:
"The Messenger of Allah (ﷺ)said:'If anyone of you is uncertain about his prayer, let him try todowhat is correct then let him prostrate twice.'"Tanafisi said: "This is the basic rule, and no one is able to reject it." (PT)
English reference (PT): Vol. 1, Book 5, Hadith 1212 (PT)
Arabic reference (PT): Book 5, Hadith 1269 (PT)