Jamieson, Fausset and Brown on Genesis 13:7

7. And there was a strife--Abraham's character appears here in a most amiable light. Having a strong sense of religion, he was afraid of doing anything that might tend to injure its character or bring discredit on its name, and he rightly judged that such unhappy effects would be produced if two persons whom nature and grace had so closely connected should come to a rupture [Ge 13:8]. Waiving his right to dictate, he gave the freedom of choice to Lot. The conduct of Abraham was not only disinterested and peaceable, but generous and condescending in an extraordinary degree, exemplifying the Scripture precepts (Mt 6:32; Ro 12:10, 11; Php 2:4).