rsv@Numbers:3:12 @ "Behold, I have taken the Levites from among the people of Israel instead of every first-born that opens the womb among the people of Israel. The Levites shall be mine,
rsv@Numbers:18:15 ...Everything that opens the...-born of man you shall redeem, and the firstling of unclean beasts you shall redeem.
rsv@Revelation:3:7 @ "And to the angel of the church in Philadelphia write: `...key of David, who opens and...