Exodus 4:23

4:23 and I said to you, ‘Let my son go that he may serve me,’ but since you have refused to let him go, I will surely kill your son, your firstborn!”’”

Exodus 8:1

8:1 (7:26) Then the Lord said to Moses, “Go to Pharaoh and tell him, ‘Thus says the Lord: “Release my people in order that they may serve me!

Exodus 10:24

10:24 Then Pharaoh summoned Moses and said, “Go, serve the Lord – only your flocks and herds will be detained. Even your families may go with you.”

Exodus 23:33

23:33 They must not live in your land, lest they make you sin against me, for if you serve their gods, it will surely be a snare to you.”

Exodus 28:41

28:41 “You are to clothe them – your brother Aaron and his sons with him – and anoint them and ordain them and set them apart as holy, so that they may minister as my priests.