ANSWER:

If this was a loud rakah, you can immediately join the imam in ruku but if this was a silent rakah or prayer, you must quickly finish fateha and then join the imam because reciting fateha in silent rakahs and prayers is a must for everyone. 

During a congregation, if a man was reciting al-Fatihah and before finishing it, the imam bowed but he continued reciting. Should he finish reciting and follow the imam thereafter or stop reciting and bow with the imam? Is his prayer invalid and does he need to repeat his prayer?

Prayer |