Deuteronomy 4:32

For ask now the generations which have been from the days of the beginning, which have been before thee from the day when the Lord created man upon the earth, from one end of the heavens to the other, whether so great a thing as this hath been, or any like to it hath been heard?

study the history of ancient times study it now

since the day The lamed is extraneous (as in many other Hebrew words), or it serves as a stylistic embellishment.

from one end of heaven alludes to the horizon, as I have explained [comment on Genesis 1: 6]

whether there has been in his life-time

Did ever a people hear This is a continuation of the previous verse, i.e., that which has never been heard

FOR ASK NOW OF THE DAYS PAST. He states “G-d will not forgive you, nor will He be long-suffering with you for idolatry and corruption with graven images and all forms of likenesses, for He has done with you what He has never done with any nation. He has made you hear the voice of G-d speaking out of the midst of the fire so that His fear may be before you and that you declare His Unity and not corrupt yourselves. He has taken you to Him a nation from the midst of another nation, by trials, by signs and by wonders so that you should not worship anything beside Him. Thus you have been shown all this with your eyes that thou mightest know that the Eternal, He is G-d, that He is One, and His Name One, and there is none else beside Him. For out of heaven He made thee to hear His voice to teach you the discipline of wisdom; and upon the earth He made thee to see His great fire burning unto the heart of heaven, and all His words thou didst hear out of the midst of the fire. And He brought thee out ‘b’phanav’ (with His presence), similar to ‘al panav’ (before His presence), with His great power which is in His presence. And since the Great Name is G-d in heaven above and upon the earth beneath, and there is none else you shall keep His commandments and His statutes so that it may be well with thee in heaven above, and that thou mayest prolong thy days upon the earth beneath.”

כי שאל נא, the proof of what I said that G’d will not forget the covenant made with your forefathers is that at Mount Sinai during the revelation all of you had been elevated to the level of prophecy. When I took you to be My people this did not mean that each and everyone of you by their own merits had deserved to be elevated to that spiritual status. I did this on account of the patriarchs. The difference between you and the gentile nations is that although the exceptional gentile may have experienced prophetic insights, there never has been a nation who have experienced something similar as a whole nation as you did at Mount Sinai.

כי שאל נא וגו, “You only have to inquire, etc.;” if you were to ask why G–d is so much more strict with us than with other nations, all you have to do is to ask yourselves if there is any nation whose fate has been as carefully supervised by G–d as yours from the time of Avraham; in light of all that He has done for you, do you not think that He is entitled to measure you by different yardsticks?