Exodus 18:12
And Jethro, Moses’ father in law, took a burnt offering and sacrifices for God: and Aaron came, and all the elders of Israel, to eat bread with Moses’ father in law before God. And Jethro, Moses’ father in law, took a burnt offering and sacrifices for God: and Aaron came, and all the elders of Israel, to eat bread with Moses’ father in law before God.
Jethro responded to his recognition of the Lord's greatness in Israel's deliverance by taking a burnt offering and sacrifices for God in worship. Aaron came, and with Moses all the elders of Israel came, to eat bread with Moses' father in law before God in shared fellowship. The sacrifice and the shared meal belonged together as parts of the gathering that followed that recognition.
The shared meal was a solemn feast that commemorated God's mercy in delivering Israel. Jethro, though a Gentile, had been singled out from the darkness of the Gentile world as one of God's appointed, heaven-sent witnesses to reveal the principles of heaven, and here he worshiped God through sacrifice and ate before God with Moses, Aaron, and the elders.