In the second half of Genesis 12, we watched Abram in one of his poorer moments as a leader. He risked the honor and even the life of his wife in order to save his own skin. Not a banner moment for Abram!
By contrast, in Genesis 13 we see a completely different side of Abram. We see him lead in a tricky situation that could easily have brought out Abram’s selfishness. Yet, in fact, he led with grace and faithfulness, and thus he offers a fitting example for us.