If in the Friday prayer or prayers on Friday one intentionally recites Sūrat al-Ikhlāṣ or Sūrat al-Kāfirūn, then even if he has not reached half of it, he cannot, based on obligatory precaution, leave it and recite Sūrat al-Jumuʿah and Sūrat al-Munāfiqūn instead. Ruling 976.* If in the obligatory or nāfilah prayers a person recites a surah other than Sūrat al-Ikhlāṣ and Sūrat al-Kāfirūn, and if he has not recited up to half of it, he can leave it and recite another surah instead.
However, if he has recited half of it, then based on obligatory precaution, it is not permitted for him to leave it and change to another surah.