Luke 20:28

The Sadducees’ commitment to the Old Testament was evident in their approach to Jesus. They began by quoting Deuteronomy 25:5 (cf. Genesis 38:8). The practice in question was levirate marriage. [Note: See Millar Burrows, "Levirate Marriage in Israel," Journal of Biblical Literature 59 (1940):23-33; idem, "The Marriage of Boaz and Ruth," Journal of Biblical Literature 59 (1940):445-54.]