'First born' in the Bible

And she gave birth to her firstborn son; and she wrapped him in swaddling clothes, and laid him in a manger because there was no room for them in the inn.

as it is written in the law of Moses, Every firstborn male shall be called holy to the Lord.

He is a visible image of the invisible God, the firstborn of all creation;

He is the head of his Body, the Church. He is the beginning, the firstborn from the dead, in order that in all things he may become preeminent.

And further, when he brought the firstborn into the habitable world, he said, Let all the angels of God worship him.

By faith he established the Passover, and the sprinkling with blood, in order that the Destroying Angel might not touch the firstborn.

to the festal assemblage and church of the firstborn, registered in heaven, to a Judge who is God of all, to the spirits of just men made perfect,

and from Jesus Christ, the faithful witness, the firstborn of the dead, and the Ruler of the kings of the earth. To Him who loves us and has loosed us from our sins in his own blood;