The ruling on the rak'ah that a latecomer joins when the imam raises his head from ruku'

Question : Shaykh, a latecomer caught up with the imam while he was in ruku', but the imam straightened up after the latecomer had said the takbir of entering prayer, and he had already begun to bow. What is required of him?

Answer : We say the rule is that one does not catch up with the rak'ah unless he is with the imam at the limit of ruku'. Do you understand? So if they meet—this one descending and this one rising—outside the scope of ruku', then he has not caught up with the rak'ah.