'First born' in the Bible

But he knew her not, till she had brought forth her Son, the first-born. And he called his name Jesus.

And she brought forth her son, the first-born, and swathed him, and laid him in the manger, because there was no room for them in the inn.

For whom he foreknew, he also predestinated, conformable to the image of his Son, that he might be the first-born among many brethren.

By faith he kept the passover, and the sprinkling of blood, lest he that destroyed the first born should touch them.

and to an innumerable company, To the general assembly of angels, and to the church of the first born, who are inrolled in heaven, and to God the Judge of all, and to the spirits of just men made perfect,