It is wajib (necessary) to recite an additional portion from the Qur'an (zamm-i surah) after Al-Fatiha in the first two rak'ahs of the obligatory prayers. Deliberately omitting a wajib act is sinful; if it is omitted or delayed due to forgetfulness, it is not sinful, but the prostration of forgetfulness (sujood as-sahw) must be performed at the end of the prayer. Accordingly, if an imam does not recite a surah or a portion of a verse after Al-Fatiha in the first two rak'ahs of a four- or three-rak'ah obligatory prayer, he must perform the prostration of forgetfulness whether or not he recites these surahs or verses after Al-Fatiha in the third and fourth rak'ahs. This is because he has delayed or omitted a wajib act in the prayer (Kâsânî, Bedâi‘, 1/166; Merğinânî, al-Hidayah, 1/74).
Source: T.C. Diyanet İşleri Başkanlığı, Din İşleri Yüksek Kurulu
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