Exodus 13:2 "...Consecrate to Me all the firstborn, whatever opens the womb..." If not mistaken, I think there is a sacrifice that is offered to "buy back" the firstborn, or otherwise account for the firstborn to God. Will have to make note of that and check later. May not be until Leviticus or Deuteronomy. 3 …
Black & White with Shades of Gray 