The ruling on reciting only al-Fatihah in the four-unit prayer

Question:
What is the ruling on one who prays a four-unit prayer and recites only al-Fatihah in the first, second, third, and fourth units? And what is the ruling on one who recites al-Fatihah in the first and second units, and recites a surah along with it in the third and fourth units?

Answer:
His prayer is valid; the prayer is valid. However, his leaving off the recitation after al-Fatihah in the first two units is a deficiency, because reciting after al-Fatihah in the first two units is a recommended practice (sunnah). So whoever leaves it off is leaving off a recommended practice, and this is a deficiency in the prayer, but the prayer is valid. It is a valid prayer in itself because its pillars and obligatory acts are complete. Yes. As for the one who reverses it, reciting al-Fatihah in the first two units and reciting from the Qur'an after al-Fatihah in the last two units, this is contrary to the Sunnah. This is contrary to the Sunnah, so this action is not permissible because it is contrary to the Sunnah of the Messenger of Allah (peace and blessings be upon him).