'First born' in the Bible

So, she bore her firstborn Son and wrapped Him in [linen] cloths and laid Him in an animal's feeding trough because there was no room for them in the lodge.

(It is recorded in the law of the Lord [Ex. 13:2, 12] that every firstborn male child be considered holy [i.e., specially dedicated] to the Lord.)

For [that class of] persons whom God knew beforehand He also predetermined to become conformed to the [spiritual] likeness of His Son, so that He could be the firstborn One among [His] many brothers [i.e., so He could be the preeminent example to all His followers. See Heb. 2:11].

He is the image of the invisible God, the firstborn One [i.e., who takes preeminence] over all that is created.

And He is the head of the [spiritual] body, the church. He is [its] source, the firstborn One from the dead [i.e., the first one to return to life, never to die again], so that He could rank first [in importance] over all things.

And again, when God sent the Firstborn One [i.e., Jesus. See Rom. 8:29; Col. 1:15, 18; Rev. 1:5] into the world, He said [Deut. 32:43 LXX], "And all of God's angels should worship Him."

By [having] faith, he established the Passover Festival [Note: This festival was first celebrated in Egypt by the fleeing Israelites, then observed annually in commemoration of that event], and had [lambs'] blood sprinkled [on the door jambs] to prevent the one who destroyed the firstborn children from touching them. [See Ex. 12:23].

and that no one becomes immoral or ungodly, like Esau, who sold his right to the firstborn son's inheritance for a single meal.

and to the church of the firstborn ones [i.e., those who have received an inheritance from their Father], whose names are recorded in heaven. [See Luke 10:20]. [You have come] to God, who is the Judge of all people, and to the spirits of righteous people who have become [morally] perfect [i.e., that great company of God's people who have gone on to their heavenly reward],

[It is also] from Jesus Christ, who is the Faithful Witness [to the truth], the Firstborn from the dead [i.e., the first One raised never to die again], the Ruler of the kings of the world. May there be honor and power forever and ever to Christ, who loved us and released us from our sins by His blood [Note: Some manuscripts say "washed us" since the two words are spelled almost alike].