Exodus 4:22-24

Young's Literal Translation

²² and thou hast said unto Pharaoh, Thus said Jehovah, My son, My first-born [is] Israel,

²³ and I say unto thee, Send away My son, and he doth serve Me; and -- thou dost refuse to send him away -- lo, I am slaying thy son, thy first-born.'

²⁴ And it cometh to pass in the way, in a lodging place, that Jehovah meeteth him, and seeketh to put him to death;