Q 2: If a person joins the congregational Salah (Prayer) while the Imam (the one who leads congregational Prayer) is reciting Qur'an after Al-Fatihah in any loudly recited Salah (Prayer), such as Maghrib (Sunset) Prayer, should this person recite Al-Fatihah first or not? Allah (Exalted be He) says:
So, when the Qur’ân is recited, listen to it, and be silent
And if the person joins the Imam while he is still standing, and then as the person starts to recite (the Ayah) Al-Hamdulillah Rab-il-`Alamin, the Imam offers Takbir (for Ruku`[bowing]), should the person follow the Imam or complete recitation to the end of Al-Fatihah?
Reciting Al-Fatihah is obligatory for the Imam, the Munfarid (person offering Prayer individually), and the Ma'mum (person being led by an Imam in Prayer) whether in Jahri (Prayer recited out loud) or Sirri (Prayer with subvocal recitation) Salahs, due to the general evidence of reciting Al-Fatihah in Salah. Whoever joins the congregational Salah and offers Takbir with the Imam should recite it (Al-Fatihah), but if the Imam offers Ruku` before the person completes its recitation, they should follow the Imam and in this case, and the Rak`ah will suffice them. Besides, whoever fully catches up with the Imam in a state of Ruku`, this will also suffice them and they are not obliged to read Al-Fatihah according to the most correct opinion of Scholars. In this case, reciting Al-Fatihah is not obligatory as a person will not be able to recite it. This is because of the famous Hadith (Part No. 6; Page No. 386) of
Abu Bakrah that is narrated in Sahih
Al-Bukhari. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.