Prayer: Must you recite a full surah after Fātiḥah, or is part of the Qur’an enough? Can you add extra verses after it?

Practical Laws of Islam as per the teachings of Imam Khamenei

Prayer: Must you recite a full surah after Fātiḥah, or is part of the Qur’an enough? Can you add extra verses after it?

English:

Question #473:

Is it obligatory in prayer to recite a whole chapter after the Fātiḥah or does it suffices to read a part of the Noble Qur’an? And in the former case, is it permissible to recite some Qur’anic verses after the chapter?

Answer #473:

In daily obligatory prayers, one should – by obligatory caution – recite one complete chapter after the Fātiḥah and recitation of some verses of the Noble Qur’an does not substitute for the recitation of a whole chapter. However, reading some verses of the Glorious Qur’an after the recitation of a whole chapter with the intention of reading Qur’an is no problem.

-Imam Khamenei, Practical Laws of Islam, Importance and Conditions of Prayer