Aal-i-Imraan 3:7

It is He Who has sent down to you the Book. In it are definite verses, which are the foundation of the Book; while others are ambiguous. Those with deviant hearts follow the ambiguous verses, seeking discord and seeking their [false] interpretation. But no one knows their [true] interpretation except Allah. And those who are well-grounded in knowledge say, “We believe in it. It is all from our Lord[4].” None will take heed except people of understanding.

[4] People of true knowledge are lauded here with the worthy epithet “al-rāsikhūna fī al-‘ilm”(the well-grounded in knowledge); they know enough and are so humble as to say: “Allah knows best”, unlike others.

It is He who has sent down to you, [O Muḥammad], the Book; in it are verses [that are] precise - they are the foundation of the Book - and others unspecific.[116] As for those in whose hearts is deviation [from truth], they will follow that of it which is unspecific, seeking discord and seeking an interpretation [suitable to them]. And no one knows its [true] interpretation except Allāh. But those firm in knowledge say, "We believe in it. All [of it] is from our Lord." And no one will be reminded except those of understanding,

[116] Those which are stated in such a way that they are open to more than one interpretation or whose meaning is known only to Allāh, such as the opening letters of certain sūrahs.

7. It is He Who has sent down to you (Muhammad صلى الله عليه وسلم) the Book (this Qur’ân). In it are Verses that are entirely clear, they are the foundations of the Book [and those are the Verses of Al-Ahkâm (commandments), Al-Fara’id (obligatory duties) and Al-Hudud (legal laws for the punishment of thieves, adulterers)]; and others not entirely clear. So as for those in whose hearts there is a deviation (from the truth) they follow that which is not entirely clear thereof, seeking Al-Fitnah (polytheism and trials), and seeking for its hidden meanings, but none knows its hidden meanings save Allâh. And those who are firmly grounded in knowledge say: "We believe in it; the whole of it (clear and unclear Verses) are from our Lord." And none receive admonition except men of understanding. (Tafsir At-Tabarî).

He it is Who hath revealed unto thee (Muhammad) the Scripture wherein are clear revelations - they are the substance of the Book - and others (which are) allegorical. But those in whose hearts is doubt pursue, forsooth, that which is allegorical seeking (to cause) dissension by seeking to explain it. None knoweth its explanation save Allah. And those who are of sound instruction say: We believe therein; the whole is from our Lord; but only men of understanding really heed.