Is asking about the reason for the difference in the wording of the Qur’anic verses, such as the difference in the letter (ma) in Surat Al-Hadid compared to Surat Al-Hashr and Al-Saff, considered following the reprehensible mutashabih (ambiguous verses)? And what is the meaning of the word “evil plotting” (al-makr al-sayyi’) in Surat Fatir?

There is no harm in asking scholars about the wisdom behind a specific word choice in the Holy Quran, as knowing this increases a Muslim's certainty that the Quran is truly the word of Allah. This question is not considered following the ambiguous (mutashabih), and scholars have drawn attention to the subtleties of these words. As for the meaning of "evil plotting" (al-makr al-sayyi'), it refers to the plotting of evil deeds, which include disbelief and deceiving the weak and turning them away from faith.