Midrasch zu Schoftim 3:20

“They took for themselves Moavite wives: the name of one was Orpa, and the name of the second was Ruth; and they dwelled there approximately ten years” (Ruth 1:4).
“They took for themselves Moavite wives.” It is taught in the name of Rabbi Meir: They did not convert them, they did not immerse them, the halakha had not yet been innovated, such that they would not have been punished for them; an Ammonite and not a female Ammonite, a Moavite and not a female Moavite.⁸⁸It had not yet been clarified that the Torah’s prohibition against marrying a convert from the nations of Amon and Moav (see Deuteronomy 23:4) applied only to male converts and not to female converts (see Yevamot 76b-77a). Maḥlon and Kilyon married them despite the fact that they did not convert, and despite the fact that, as far as they were aware, it was forbidden to marry them even if they converted.
“The name of one was Orpa,” because she turned her back [oref] to her mother-in-law. “And the name of the second was Ruth [Rut],” because she saw [ra’ata] truth in the words of her mother-in-law. Rabbi Beivai said in the name of Rabbi Reuven: Ruth and Orpa were the daughters of Eglon, as it is stated: “I have a secret matter for you king.⁸⁹Eglon, king of Moav. He said: Be silent…” (Judges 3:19), and it is written: “Ehud came to him…Ehud said: I have a matter of God to you, and he stood from his throne” (Judges 3:20). The Holy One blessed be He said to him: ‘You arose from your throne in deference to Me, by your life, I will establish a son from you who will sit on the throne of God.’
“They dwelled there approximately ten years.” [Whenever a verse uses this terminology, such as:]“Approximately thirty” (Judges 20:31), “approximately forty” (Joshua 4:13), [it means a bit] less or more [than the stated number].

Another interpretation (of Numb. 14:27): HOW LONG SHALL THIS EVIL CONGREGATION <BE MURMURING AGAINST ME>? This text is related (to Mal. 1:11): FOR FROM THE RISING OF THE SUN [EVEN] TO WHERE IT SETS MY NAME SHALL BE GREAT AMONG THE GENTILES. The Holy One said: The nations of the world honor me; but as for you, how many miracles have I performed for you?.²³Numb. R. 16:27. Still you provoke me. Do you want to know <the facts>? Eglon, king of Moab, was uncircumcised. Then Ehud ben Gera entered where he was; and as soon as he mentioned my name to him, he showed me honor and rose from his seat, as stated (in Jud. 3:20): NOW WHEN EHUD CAME UNTO HIM, HE WAS SITTING BY HIMSELF IN HIS COOL UPPER ROOM. THEN EHUD SAID: I HAVE A WORD FROM GOD FOR YOU; SO HE AROSE FROM HIS SEAT. <This was> to fulfill what was said (in Mal. 1:11): FOR FROM THE RISING OF THE SUN [EVEN] TO WHERE IT SETS MY NAME SHALL BE GREAT AMONG THE GENTILES. The Holy One said: The nations of the world honor me; and they show me respect. Yet when you provoke me, I plead with you. How long do I tolerate <you>? (Numb. 14:27:) HOW LONG SHALL THIS EVIL CONGREGATION <BE MURMURING AGAINST ME>?

He went in to Eglon, and said: “I have a message from God unto thee.” And he arose out of his seat (Judg. 3:20). The Holy One, blessed be He, said to him: You honored Me by arising from your throne; be assured, I will cause your daughter to rear a son who will sit on My throne. This refers to Ruth the Moabitess, from whom Solomon descended. Solomon sat on the throne of the Lord as king (I Chron. 29:23). What is written about Ehud? And Ehud put forth his left hand, and took the sword from his right side, and thrust it into his belly (Judg. 3:21). In the morning he devoureth prey (Gen. 49:27) alludes to the fact that he thrust the sword into his belly; and at even he divideth the spoil refers to the land which he took as spoil.

27 Another interpretation (of Numb. 14:27), “How long”: This text is related (to Mal. 1:11), “For from the rising of the sun [even] to where it sets, My name shall be great among the gentiles.” The Holy One said, “The nations of the world honor Me; but as for you, how many miracles have I performed for you? Still you provoke Me. Do you want to know [the facts]? Eglon, king of Moab, was uncircumcised. Then Ehud ben Gera entered where he was; and as soon as he mentioned My name to him, he showed Me honor and rose from his seat,” as stated (in Jud. 3:20), “then Ehud said, ‘I have a word from God for you’; so he arose from his seat.” This was to fulfill what was said (in Mal. 1:11), “For from the rising [of the sun to where it sets my name shall be great among the gentiles].” The Holy One said, “The nations of the world honor Me; and they show Me respect. Yet when you provoke Me, I plead with you. How long do I tolerate you?” (Numb. 14:27) “How long shall this evil congregation?” The Holy One said, “As it were, someone buys himself a servant, so that the servant may take the lantern⁵³Gk.: phanos. and give light to the one who bought him; but I did not do so. Rather, though you are My servants, [as stated] (in Lev. 25:55), ‘For to Me the Children of Israel are servants,’ I have taken the lantern and given light to them.” Another interpretation (of Numb. 14:27): By universal custom one buys himself a servant so that, if he sets out on the road, his slave will go ahead and prepare for him safe and well supplied quarters;⁵⁴Gk.: etoimasia (“preparation”). but I have not done so. Rather, though you are My servants, I prepared quarters for you, as stated (in Numb. 10:33), “and the ark of the covenant of the Lord [traveled ahead of them three days' journey] to seek out a resting place for them.” Another interpretation (of Numb. 14:27): By universal custom one buys himself a servant so that his servant will bake bread for him, but I did not do so. Rather, though you are My servants, I baked for you bread from the heavens.” And so it says (in Ps. 78:25), “Each one ate the bread of the mighty.”