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 23:22

23:22 But if you diligently obey him and do all that I command, then I will be an enemy to your enemies, and I will be an adversary to your adversaries.