'First born' in the Bible

And the day is, that his sons and his daughters are eating, and drinking wine, in the house of their brother, the first-born.

While this one is speaking another also hath come and saith, 'Thy sons and thy daughters are eating, and drinking wine, in the house of their brother, the first-born.

"Were you born the firstborn of the human race? And were you brought forth {before} [the] hills?

It shall devour the strength of his skin: even the firstborn of death shall devour his strength.