Genesis 13:7

And there was a strife between the herdmen of Abram's cattle and the herdmen of Lot's cattle. And the Canaanite and the Perizzite dwelled then in the land. Clashes between the herdmen of the two rich men were almost inevitable, since both parties tried to get the best pasturage for their masters. It was an uncomfortable situation, to say the least, and the matter was rendered still more complicated by the fact that the tribe of the Perizzites, of whose descent nothing is known, and the Canaanites were in possession of the best pastures, Lot and Abram being expected to divide between them what was left.