Moses
Genesis 13:8ESV·traditional attribution

Then Abram said to Lot, “Let there be no strife between you and me, and between your herdsmen and my herdsmen, for we are kinsmen.

John Calvin Reformed @genevareformer

8. And Abram said unto Lot . Moses first states, that Abram no sooner perceived the strifes which had arisen, than he fulfilled the duty of a good householder, by attempting to restore peace among his domestics; and that afterwards, by his moderation, he endeavored to remedy the evil by removing it.

Matthew Henry Presbyterian @wholebiblehenry

We have here an unhappy falling out between Abram and Lot, who had hitherto been inseparable companions (see Gen 13:1, and Gen 12:4), but now parted. I. The occasion of their quarrel was their riches. We read (Gen 13:2) how rich Abram was; now here we are told (Gen 13:5) that Lot, who went with Abram, was rich too; and therefore God blessed him with...

Commenting on Genesis 13:5-9

John Gill Reformed Baptist @doctorgill

And Abram said unto Lot,.... Being either an ear witness himself of the contentions of their servants, or having it reported to him by credible persons, he applied himself to Lot, in order to make peace, being a wise and good man; and though he was senior in years, and superior in substance, and higher in the class of relation, and upon all accounts the...