'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.

It consumeth the parts of his skin, Consume his parts doth death's first-born.