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18 And to Enoch was born Irad: and Irad begat Mehujael: and Mehujael begat Methusael: and Methusael begat Lamech.
'To open,' as in Revelation 9, signifies communication and conjunction.
(Odkazy: Apocalypse Explained 537)
9 It shall be for a sign to you on your hand, and for a memorial between your eyes, that the law of Yahweh may be in your mouth; for with a strong hand Yahweh has brought you out of Egypt.