Verse 13:[1] So Boaz (Ruth 3:11) took Ruth, and she was his wife: and when he went in unto her, (Gen. 29:31; 33:5) the LORD gave her conception, and she bare a son.
[Boaz took Ruth] Question: How was he able to take a foreign woman? Response: Because she had already been converted to God, and there was no danger of leading her husband astray; which was the sole reason for the prohibition of marriage with such (thus Munster).
Boaz took Ruth; which he might do, though she was a Moabite, because the prohibition against marrying such is to be restrained to those who continue in the heathenish estate, as is evident from the reason of it; whereas Ruth was a sincere proselyte and convert to the God and faith of Israel. He went in unto her, that is, had conjugal converse with her. See Genesis 6:4.
[He granted…that she might conceive (thus Vatablus, Tirinus), הֵרָיוֹן] A fœtus, or conception (Septuagint, Jonathan, Pagnine, Montanus).
Conception, that is, strength to conceive and retain seed.
[1] Hebrew: וַיִּקַּ֙ח בֹּ֤עַז אֶת־רוּת֙ וַתְּהִי־ל֣וֹ לְאִשָּׁ֔ה וַיָּבֹ֖א אֵלֶ֑יהָ וַיִּתֵּ֙ן יְהוָ֥ה לָ֛הּ הֵרָי֖וֹן וַתֵּ֥לֶד בֵּֽן׃
Matthew Henry: 'Here is, I. Ruth a wife. Boaz took her, with the usual solemnities, to his house, and she became his wife (Ruth 4:13), all the city, no doubt, congratulating the preferment of a virtuous woman, purely for her virtues. We have reason to think that Orpah, who returned from Naomi to her people and her gods, was never half so well preferred as Ruth was. He that forsakes all for Christ shall find more than all with him; it shall be recompensed a hundredfold in this present time. Now Orpah wished she had gone with Naomi too; but she, like the other kinsman, stood in her own light. Boaz had prayed that this pious proselyte might receive …