Parallel
Deuteronomy 25:5
Brenton's English Septuagint · Berean Standard Bible
And if brethren should live together, and one of them should die, and should not have seed, the wife of the deceased shall not marry out [of the family] to a man not related: her husband's brother shall go in to her, and shall take her to himself for a wife, and shall dwell with her.
When brothers dwell together and one of them dies without a son, the widow must not marry outside the family. Her husband’s brother is to take her as his wife and fulfill the duty of a brother-in-law for her (note: Cited in Matthew 22:24, Mark 12:19, and Luke 20:28).