Rules of Reciting Sūrah When One Knows He Will Reach Imam’s Ruku‘
Issue No. 1260- If a person is sure that if he recites the sūrah, he will be able to join the imam in his rukū‘, he should, as an obligatory precaution, recite the sūrah. In case however, he recites the sūrah, but he does not reach the imam in his rukū‘, his congregational prayer is in order.