'Heir' in the Bible

And Abram saith, 'Lo, to me Thou hast not given seed, and lo, a domestic doth heir me.'

And lo, the word of Jehovah is unto him, saying, 'This one doth not heir thee; but he who cometh out from thy bowels, he doth heir thee;'

and lo, the whole family hath risen against thy maid-servant, and say, Give up him who smiteth his brother, and we put him to death for the life of his brother whom he hath slain, and we destroy also the heir; and they have quenched my coal which is left -- so as not to set to my husband a name and remnant on the face of the ground.'

Concerning the sons of Ammon: 'Thus said Jehovah: Sons -- hath Israel none? heir -- hath he none? Wherefore hath Malcam possessed Gad? And his people in its cities have dwelt?