Exodus 18:12

And Jethro, Moses' father-in-law, took a burnt offering and sacrifices for God, the belief in whom he had so openly confessed, giving evidence of his faith by this act of sacrifice. And Aaron came and all the elders of Israel to eat bread with Moses' father-in-law before God. The children of Israel could enter into both religious and social fellowship with the man who had so openly confessed his belief in the true God. Eating bread before God was said of the sacrificial meal, the Lord being present as the invisible Guest. As Jethro here partook of the blessings of Israel, so heathen nations in after-years were called to the enjoyment of the Messianic hope and promises.