Targum zu Bereschit 13:7

And contentions arose between the shepherds of Abram's flock, and the shepherds of the flocks of Lot; for the shepherds of Abram had been instructed by him not to go among the Kenaanaee and the Pherizaee, who, as yet, had power in the land, and to restrain the cattle that they should make no depredation in going to the place of their pasture: but the shepherds of Lot would go and feed in the grounds of the Kenaanaee and Pherizaee who yet dwelt in the land.

And there was strife between the shepherds of Abram's cattle and the shepherds of the cattle of Lot. The shepherds of Abram restrained their beasts until the time of their coming to the place of their pasture; but the shepherds of Lot did not restrain their beasts, but turned them free, and went. But Abram's shepherds had been instructed by Abram their righteous master, Go not to the Kenaanaee and Pherizaee; for as yet they have possession in the land.