Ambrose of Milan, on Ruth 4:7

“Now this in former times was the manner in Israel between kinsmen, that if at any time one yielded his right to another: that the grant might be sure, the man put off his shoe, and gave it to his neighhour; this was a testimony of cession of right in Israel.”

“For, by the law, when a man died, the marriage bond with his wife was passed on to his brother or other male next of kin, in order that the seed of the brother or next of kin might renew the life of the house. And so it was that Ruth, though she was foreign-born, had possessed a husband of the Jewish people who had left a kinsman of near relation. Although she was seen and loved by Boaz while gleaning and maintaining herself and her mother-in-law with what she gleaned, she could not become the wife of Boaz until she had first loosed the shoe from him whose wife she ought, by the law, to have become.The story is a simple one, but deep are its hidden meanings, for that which was done was the outward signs of something more. If indeed we should stretch the sense so as to fit the letter exactly, we should almost find the words an occasion of a certain shame and horror, that we should regard them as intending and conveying the thought of common bodily intercourse. Rather it was the foreshadowing of one who was to arise from the Jewish people—whence Christ was, after the flesh—who should, with the seed of heavenly teaching, revive the seed of his dead kinsman, that is to say, the people, and to whom the precepts of the law, in their spiritual significance, assigned the sandal of marriage, for the espousals of the church.”

Imported from an open dataset — not yet checked against the printed edition.