וְאֶתְכֶם לָקַח יְהֹוָה וַיּוֹצִא אֶתְכֶם מִכּוּר
“You hath the L-RD taken and brought forth out of the iron furnace.”
– Deuteronomy 4:20, JPS 1917 Tanach
Rashi explains, “a כור is a vessel in which one refines gold” (sefaria.org). Moshe’s choice of words, attempts to impress upon the new generation, that the nisyanos (challenges) in Egypt, were meant to serve as a means to refine the people. Consider that when gold is placed in “a refiner’s fire,” the impurities are drawn out; consequently, what remains is pure. On the level of practical application, the soul is also refined, through the challenges of life, in order to be free from taint.
Consider the following as well, Joseph, who went ahead of the children of Israel into Egypt, endured many challenges, “until the time that His word came to pass; the word of the L-rd had tested him” (Psalms 105:19). His character was refined in the refiner’s fire, in preparation for his role as a leader in Egypt, only second to Pharoah. In this manner, he was tested, until his prophetic dreams were fulfilled by H’Shem, through the circumstances of his life.
Moshe continues, “The L-RD shall scatter you among the peoples, and ye shall be left few in number among the nations, whither the L-RD shall lead you away” (Deuteronomy 4:27). “From thence ye will seek the L-RD thy G-d; and thou shalt find Him, if thou search after Him with all thy heart and with all thy soul” (Deuteronomy 4:29). These words are addressed to the current generation; this is denoted by the phrase, “the end of days,” wherein we currently are on the Biblical timeline.
בַּצַּר לְךָ וּמְצָאוּךָ כֹּל הַדְּבָרִים הָאֵלֶּה בְּאַֽחֲרִית הַיָּמִים וְשַׁבְתָּ עַד־יְהֹוָה אֱלֹהֶיךָ וְשָֽׁמַעְתָּ בְּקֹלֽוֹ׃
“In thy distress, when all these things are come upon thee in the end of days, thou wilt return to H’Shem thy G-d, and hearken unto His voice; for the L-RD thy G-d is a merciful G-d; He will not fail thee.” – Deuteronomy 4:30-31
“G-d assayed to go and take Him a nation from the midst of another nation, by trials, by signs, and by wonders” (Deuteronomy 4:34). So too, will He lead us out of exile. As the sages note, the time that precedes the Final Redemption, will mirror the plagues that preceded the First Redemption, when B’nei Yisrael was led out of Egypt. “There shall be a time of trouble, such as never was since there was a nation even to that same time; and at that time thy people shall be delivered, every one that shall be found written in the book” (Daniel 12:1, JPS 1917 Tanach).