Commentary
This Surah is Makki, although Muqatil رحمۃ اللہ علیہ has said that the verse وَاسْأَلْ مَنْ أَرْسَلْنَا Az-Zukhruf 43:45 ⧉ is Madam, and according to another view, this Surah was revealed in Heaven during Lailat-ul-Mi` raj (the Night of Ascention) (Ruh u1-Ma’ ani) - Allah knows best.
Ha Meem- Only Allah knows its meaning.
وَالْكِتَابِ الْمُبِينِ (By the manifest Book - Az-Zukhruf 43:2 ⧉) The book in this verse Az-Zukhruf 43:2 ⧉ refers to the Holy Qur'an. Whenever Allah swears by anything, it is usually an argument for the statement that follows. Swearing by the Qur'an in this verse Az-Zukhruf 43:2 ⧉ is an indication that the Qur'an, by virtue of being a miracle, is a proof in itself of its being a Divine Book. To call it a 'manifest book' means that its subjects consisting of exhortations and advices are easily understandable; but as far as deduction of the precepts of 'Shari'ah' is concerned, it certainly is a difficult job which cannot be performed without complete capability of 'ijtihad'. This point has been clarified in Surah Alqamar⧉, Az-Zukhruf 43:17 ⧉ وَلَقَدْ يَسَّرْنَا الْقُرْآنَ لِلذِّكْرِ فَهَلْ مِن مُّدَّكِرٍ (And indeed We have made the Qur'an easy for seeking advice. So, is there one to seek advice? - 54-17). Here, it has been stated that the Qur'an is easy for obtaining advice. Hence, it does not necessarily follow that ijtihad and inferring injunctions will be easy also; rather, it is proved through other evidences that full expertise in related subjects is a necessary condition for this exercise.