It is not permissible to precede the imam in the takbir of ihram and the takbirs of transition
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Question:
The one who is late to the prayer, if he arrives while the people are in prayer, Honorable Shaykh?
Answer:
Yes, he enters with them, saying the takbir and entering with them, even if the imam has not yet said the second takbir, because they are in prayer, so he enters with them. And when the imam stands, he follows him in standing. The thing in which it is not permissible for the ma'mum to precede the imam is the takbir of ihram. The takbirs of transition are those in which it is not permissible for the ma'mum to precede the imam. Yes.
The one who is late to the prayer, if he arrives while the people are in prayer, Honorable Shaykh?
Answer:
Yes, he enters with them, saying the takbir and entering with them, even if the imam has not yet said the second takbir, because they are in prayer, so he enters with them. And when the imam stands, he follows him in standing. The thing in which it is not permissible for the ma'mum to precede the imam is the takbir of ihram. The takbirs of transition are those in which it is not permissible for the ma'mum to precede the imam. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، 1599 - لا يجوز مسابقة الإمام في تكبيرة الإحرام وتكبيرات الانتقال - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.