Rth 4:6-13
“I cannot redeem it for myself, lest I mar mine own inheritance.” The redemption would cost money, since the yearly produce of the field would have to be paid for up to the year of jubilee. Now, if he acquired the field by redemption as his own permanent property, he would have increased by so much his own possessions in land. But if he should marry Ruth, the field so redeemed would belong to the son whom he would beget through her, and he would therefore have parted with the money that he had paid for the redemption merely for the son of Ruth, so that he would have withdrawn a certain amount of capital from his own possession, and to that extent have detracted from its worth. “Redeem thou for thyself my redemption,” i.e., the field which I have the first right to redeem.