The ruling on reversing the order of surahs in prayer

Question:
He asks: Is it permissible to recite, for example, Surat al-Ikhlas in the first rak'ah, and then recite Surat al-Kafirun in the second rak'ah, or in the same rak'ah, meaning reversing the order of the surahs?

Answer:
Reversing the order of the surahs is disliked (makruh) because the arrangement of the surahs is the ijtihad (independent legal reasoning) of the Companions, unlike the verses, whose arrangement is by the explicit text of the Messenger of Allah (peace and blessings be upon him). Nevertheless, reversing the order of the surahs is disliked, but the prayer remains valid despite the dislike.