'First born' in the Bible

but he kept her a virgin until she had given birth to a Son [her firstborn child]; and he named Him Jesus (The Lord is salvation).

and she gave birth to her Son, her firstborn; and she wrapped Him in [swaddling] cloths and laid Him in a manger, because there was no [private] room for them in the inn.

(as it is written in the Law of the Lord, “Every firstborn male that opens the womb shall be called holy [set apart and dedicated] to the Lord)”

For those whom He foreknew [and loved and chose beforehand], He also predestined to be conformed to the image of His Son [and ultimately share in His complete sanctification], so that He would be the firstborn [the most beloved and honored] among many believers.

He is the exact living image [the essential manifestation] of the unseen God [the visible representation of the invisible], the firstborn [the preeminent one, the sovereign, and the originator] of all creation.

He is also the head [the life-source and leader] of the body, the church; and He is the beginning, the firstborn from the dead, so that He Himself will occupy the first place [He will stand supreme and be preeminent] in everything.

And when He again brings the firstborn [highest-ranking Son] into the world, He says,“And all the angels of God are to worship Him.”

By faith he kept the Passover and the sprinkling of the blood [on the doorposts], so that the destroyer of the firstborn would not touch them (the firstborn of Israel).

and to the general assembly and assembly of the firstborn who are registered [as citizens] in heaven, and to God, who is Judge of all, and to the spirits of the righteous (the redeemed in heaven) who have been made perfect [bringing them to their final glory],

and from Jesus Christ, the faithful and trustworthy Witness, the Firstborn of the dead, and the Ruler of the kings of the earth. To Him who [always] loves us and who [has once for all] freed us [or washed us] from our sins by His own blood (His sacrificial death)—