'First born' in the Bible

But when he again brings his firstborn into the world, he says, "Let all the angels of God worship him!"

By faith he kept the Passover and the sprinkling of the blood, so that the one who destroyed the firstborn would not touch them.

and congregation of the firstborn, who are enrolled in heaven, and to God, the judge of all, and to the spirits of the righteous, who have been made perfect,