'Issue' in the Bible

“Now, behold, I have taken the Levites from among the sons of Israel instead of every firstborn, the first issue of the womb among the sons of Israel. So the Levites shall be Mine.

for they are wholly given to Me from among the sons of Israel. I have taken them for Myself instead of every first issue of the womb, the firstborn of all the sons of Israel.

Every first issue of the womb of all flesh, whether man or animal, which they offer to the Lord, shall be yours; nevertheless the firstborn of man you shall surely redeem, and the firstborn of unclean animals you shall redeem.