Exodus 4:23-25

Young's Literal Translation

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;

²⁵ and Zipporah taketh a flint, and cutteth off the foreskin of her son, and causeth [it] to touch his feet, and saith, `Surely a bridegroom of blood [art] thou to me;'