The Pulpit Commentary - Genesis 15:16
But in the fourth generation ,—τετάρτη δὲ γενεᾷ ( LXX .); but, more correctly, the fourth generation, calculating 100 years to a generation. "Caleb was the fourth from Judah, and Moses from Levi, and so doubtless many others" (Bush). Drs. Oort and Kuenen, reckoning four generations as a far shorter space of time than four centuries, detect a contradiction between this verse and Genesis 15:13 , and an evidence of the free use which the ancient and uncritical Israelitish author made... read more
The Pulpit Commentary - Genesis 15:15
And thou shalt go to thy fathers in peace (cf. Genesis 25:8 ; Genesis 35:29 ; Genesis 49:33 ). Not a periphrasis for going to the grave (Rosenmüller), since Abram's ancestors were not entombed in Canaan; but a proof of the survival of departed spirits in a state of conscious existence after death (Knobel, Murphy, Wordsworth, 'Speaker's Commentary,' Inglis), to the company of which the patriarch was in due time to be gathered. The disposal of his remains is provided for in what follows.... read more