Genesis 15:15 - Coke's Commentary on the Holy Bible

Thou shalt go to thy fathers in peace— It appears that this verse only concerns Abram personally, but all the rest of the prophecy respects his posterity. Some, says Parker, think this, Thou shalt go to thy fathers in peace, was no more than an oriental phrase for going to the grave: but it cannot be said of Abram that he did thus go to his fathers, since his dead body was so far from being laid with them in their sepulchre, that it was deposited in a country which had no manner of communication with that of his fathers: so that, from the text, an argument may justly be drawn for the separate existence of human souls, and for their departure hence, when they drop the mortal body, to go to live with those who have gone before them into the region of spirits.