ANSWER:

This is not true.

The sunnah is to keep your back straight but if one doesn’t, his prayer is not invalid. 

QUESTION: Is it true that if your back is not straight in sujud that your prayer is invalid?

Prayer | January 28, 2024 9:20 am
Previous

QUESTION: Is hashish haram? My brother is addicted to this when fathers scolds him he misbehaves and says it is just a herb.
Next

QUESTION: Sheikh should we Recite fatiha beside the imam when he is reciting ? And if yes then how?