Forgetting Performing Rukū‘
Issue No.880- If a person forgets to perform rukū‘, and sits down after reciting al-fātiḥa and sūrah, and then remembers that he has not performed rukū‘, he should first stand up and then go to rukū‘. If he returns to rukū‘ immediately (without having stood up first), his prayer will be void because he has not performed the qīyām connected to rukū‘