Verse 3:7 is a very crucial verse, it is in fact a how-to instruction in understanding the whole of Quran. Unfortunately many fail in interpreting this very simple and easy to understand verse.
You have quoted the Sahih International interpretation with a comment below:
[3:7]: “It is He who has sent down to you, [O Muhammad], the Book; in it are verses precise (Ayaatun Muhkamaatun) - they are the foundation of the Book - and others unspecific (mutashābihātun – allegorical). As for those in whose hearts is deviation, they will follow that of it which is unspecific (tashābaha), seeking discord and seeking an interpretation [suitable to them]. And no one knows its [true] interpretation except Allah. 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.”
Please pay attention to the word “Ayaatun Muhkamaatun – verses containing precise and established commandments and orders.” Is it conceivable that God orders us, humans to follow some clear commands but then leave those commands to be hanging and vague, to be subjectively interpreted, and played around as and when one desires? No, it is neither conceivable nor God left it to likes of brother Jawaid to define His verses. The purpose of various prophets was to not only convey the verses but also to act upon these verses, thereby removing any ambiguity if someone thought to be an ambiguity to begin with.
Now compare the above interpretation with Dr Shabbir’s QXP rendition below, it should become clear to you the concept of allegories and how to interpret it using Tasreef:
3:7 (The Book He has sent down, bears an important Principle.) He is the One Who has revealed to you (O Prophet) the Scripture. In it some verses are fundamental (literal with established meanings), while some verses are allegorical. The verses that pertain to Permanent Values have been presented literally.
These verses, 'Muhkamat', are the essence of the Divine Laws. But abstract phenomena, historical events, the future and the World of the Unseen are described in similes, metaphors and allegories (Mutashaabihaat) for your understanding. But those who are given to crookedness in their hearts pursue the allegories and try to give them literal meanings, thus creating dissension of thought. None encompasses their final meaning (of such as the Essence of God, His Throne, His Hand, His Book of Decrees, the exact mode of Revelation on the heart of the Messengers, the Eternity) but God. Those who are well founded in knowledge understand why the allegories have been used and they keep learning from them. They proclaim the belief that the entire Book is from their Lord. As the human knowledge evolves, more and more allegories will unfold their literal meaning. But only the men and women of understanding will bear this fact in mind. [Every verse of the Qur'an is absolute truth. The context enables us to understand which ones are to be taken literally and which ones are to be taken allegorically. Each verse in the Book complements another. Many of today's allegorical verses will become literal as the human knowledge evolves. 11:1, 39:23, 41:53, 47:20, 74:31]