Midrash su Giudici 20:12

Regarding that which the verse states: “Shaḥarayim begot children in the field of Moav [after he had sent them away, Ḥushim and Baara his wives]” (I Chronicles 8:8), Elijah, of blessed memory, asked Rabbi Nehorai, he said to him: ‘What is this that is written: “Shaḥarayim begot in the field of Moav”?’ [Rabbi Nehorai] said to him: ‘A great man begot in the field of Moav.’ “After he had sent them away” (I Chronicles 8:8) – as they were from the tribe of Benjamin, as it is written: “The tribes of Israel sent men through all the tribe of Benjamin, saying” (Judges 20:12).¹⁴³Just as the term “sent” appears in Judges regarding the tribe of Benjamin, the verse in Chronicles is hinting to the fact that the man’s wives were from the tribe of Benjamin.
Another interpretation, “Shaḥarayim,” this is Boaz. Why was his name called Shaḥarayim? It is because he was free [meshuḥrar] of iniquities. “Begot in the field of Moav,” as he begot from Ruth the Moavite. “After he had sent them away,” as he was from the tribe of Judah, as it is stated: “And he sent Judah before him to Joseph” (Genesis 46:28). “Ḥushim and Baara his wives,” does a man beget his wives? Rather, he was swift like a leopard and articulated the halakha:¹⁴⁴He expounded the verse: “An Amonite and a Moavite shall not enter the congregation of the Lord” (Deuteronomy 23:4). An Amonite but not an Amonite woman, a Moavite but not a Moavite woman. “He begot from Ḥodesh his wife” (I Chronicles 8:9) – it should have stated only, “from Baara his wife.” Rather, in his days, the halakha of an Amonite but not an Amonite woman, a Moavite and not a Moavite woman, was introduced [nitḥadsha].
One verse says: “Yitra the Ishmaelite” (see I Chronicles 2:17), and one verse says: “Yitra the Israelite” (II Samuel 17:25). Rabbi Yehoshua ben Levi said: He is Yitra the Ishmaelite, he is Yitra the Israelite.¹⁴⁵Both verses refer to the same person. Rabbi Shmuel bar Naḥman and the Rabbis: Rabbi Shmuel said: He was an Ishmaelite, and you say Israelite? Rather, he was an Ishmaelite. He entered the study hall and found Yishai sitting and expounding thus: “Look to Me, and be saved, all the ends of the earth…” (Isaiah 45:22).¹⁴⁶Anyone from all the ends of the earth can look to God and be saved. He converted, and [Yishai] gave him his daughter. The Rabbis say: He was an Israelite, and you say Ishmaelite? Rather, he was an Israelite and he girded his sword like an Ishmaelite. He stuck his sword in the middle of the study hall and said: I will either kill or be killed until I establish the halakha for the multitudes, so that anyone who abrogates this halakha, I will behead him with this sword: An Amonite but not an Amonite woman, a Moavite and not a Moavite woman.

Another interpretation (of Gen. 30:24): MAY THE LORD ADD (yosef) [ANOTHER SON FOR ME. Resh Laqish said:] The addition of the Holy One is greater than the original < gift >.⁶⁵Above, 5:10; see Gen. R. 61:4. From whom do you learn this? From Hezekiah, whose reign was fourteen years; but, when the Holy One made an addition for him, he added fifteen years. Thus it is stated (in II Kings 20:6): AND I WILL ADD FIFTEEN YEARS TO YOUR LIFE. Ergo, the addition is greater than the original. And so you find in the case of Benjamin, when his mother said to him (in Gen. 30:24): MAY THE LORD ADD (yosef) ANOTHER SON FOR ME, the Holy One also added for her ten tribes from him and two tribes from Joseph.⁶⁶Thus the addition (Benjamin) was five times greater than the original (Joseph). Gen. R. 61:4 cites the list of Benjamin’s ten sons in Gen. 46:21. R. Samuel bar Nahman said: The Holy One raised up twelve tribes from Rachel, ten from Benjamin and two from Joseph. And where is it shown that < the ten > were sons of Benjamin? Where it is written (in I Sam. 9:21): THEN SAUL ANSWERED AND SAID: AM I NOT A BENJAMINITE, FROM THE SMALLEST OF THE TRIBES OF ISRAEL, [AND MY CLAN THE SMALLEST OF THE CLANS OF THE TRIBES OF BENJAMIN]? And another verse says (in Jud. 20:12): AND {SAUL} [THE TRIBES OF ISRAEL] SENT [PEOPLE] AMONG ALL THE TRIBES OF BENJAMIN, SAYING. When the prophets saw that the addition was greater than the original, they began to bless Israel with the addition (rt.: YSP). Moses our Master said (in Deut. 1:11): MAY THE LORD GOD OF YOUR ANCESTORS ADD (rt.: YSP) TO YOUR NUMBERS < A THOUSAND TIMES > MORE THAN YOU ARE. David also said (in Ps. 115:14): MAY THE LORD ADD (rt.: YSP) TO YOUR NUMBERS, YOURS AND YOUR CHILDREN'S ALSO. In the world to come as well the Holy One will gather the exiles of Israel by means of this word (with the Hebrew root YSP). Thus it is stated (in Is. 11:11): AND IT SHALL COME TO PASS IN THAT DAY, THE LORD WILL EXTEND (rt.: YSP) HIS HAND A SECOND TIME TO PROCURE THE REST OF HIS PEOPLE.