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 of his materials.
On the import of דּוֹר vide Genesis 6:9—they shall come hither again (literally, shall return hither): for the iniquity of the Amorites is not yet full. Literally, for not completed the iniquity of the Amorites (vide Genesis 14:7; here put for the entire population!
until then (the same word as "hither, which is its usual signification).