Jews, Protestants and Catholics have different versions of the Ten Commandments. Even within Judaism, the ancient rabbis held different views of which commandments were among the 10 given with such pomp and circumstance at Mount Sinai.
Enter Jethro, the high priest of Midian, the father-in-law of Moses. He's heard all about God's kindness to the Israelites: the redemption from Egypt, the split sea, the war with Amalek, the manna and the water in the desert.