Reciting Al-Fatihah is required in Every Rak`ah of the Prayer

All of these facts testify to the requirement that reciting the Qur'an (Al-Fatihah) in the prayer is required, and there is a consensus between the scholars on this ruling. The Hadith that we mentioned also testifies to this fact, for the Prophet said,

«مَنْ صَلَّى صَلَاةً لَمْ يَقْرَأْ فِيهَا بِأُمِّ الْقُرْآنِ فَهِيَ خِدَاجٌ»

(Whoever performs any prayer in which he did not recite Umm Al-Qur'an, his prayer is incomplete.)
Also, the Two Sahihs recorded that `Ubadah bin As-Samit said that the Messenger of Allah said,

«لَا صَلَاةَ لِمَنْ لَمْ يَقْرَأْ بِفَاتِحَةِ الْكِتَابِ»

(There is no prayer for whoever does not recite the Opening of the Book.)
Also, the Sahihs of Ibn Khuzaymah and Ibn Hibban recorded that Abu Hurayrah said that the Messenger of Allah said,

«لَا تُجْزِئُ صَلَاةٌ لَا يُقْرَأُ فِيهَا بِأُمِّ الْقُرآنِ»

(The prayer during which Umm Al-Qur'an is not recited is invalid.)
There are many other Hadiths on this subject. Therefore, reciting the Opening of the Book, during the prayer by the Imam and those praying behind him, is required in every prayer, and in every Rak`ah.