מדרש על דברים 25:1

(Devarim 25:1) "If there be a quarrel among men": Peace cannot result from a quarrel. And thus is it written (Bereshith 13:17) "And there was a quarrel between the herdsmen of Abraham's cattle and those of Lot's cattle." What is it that caused Lot to separate from that tzaddik (Abraham)? A quarrel. Here, too, what is it that caused this one to receive stripes (in beth-din)? [see verse 2]) A quarrel.