Alif-Lam-Ra *; these are verses of the Book of wisdom. (*alphabets of the Arabic language; Allah and to whomever He reveals, know their precise meanings.
Alif, Lam, Ra. (Only Allah and the Messenger [blessings and peace be upon him] know the real meaning). These are the Verses of the Book which is all wisdom
Alif-Lam-Ra. (These letters are one of the miracles of the Quran, and none but Allah (Alone) knows their meanings). These are the Verses of the Book (the Quran) Al-Hakeem (showing lawful and unlawful things, explaining Allahs (Divine) Laws for mankind, leading them to eternal happiness by ordering them to follow the true Islamic Monotheism, - worshipping none but Allah Alone - that will guide them to Paradise and save them from Hell)
Alif, Lam, Ra... These are the signs of the Book of Wisdom (Hakim; the source of the knowledge of the reality full of wisdom).
Sayyed Abbas Sadr-Ameli
Alif 'A', Lam 'L', Ra 'R'. These are the verses of the Book of Wisdom.
Al-muntakhab fi tafsir al-Qur'an al-Karim
A. (Alef), L. (Lam), R. (Raa), the Surah opens with these introductory letters from the Arabic Alphabet to draw attention to the miracle of the Quran which though written in the people's tongue, cannot be emulated. These divine words -the preceding and those to follow- are divinely discoursed, verses, constituting the Book -the Quran- and verses wisdom to divine knowledge