Charles H. Spurgeon on Psalms 133:1

Brethren. Abraham made this name, "brethren", a mediator to keep peace between Lot and him: "Are we not brethren?" saith Abraham. As if he should say, Shall brethren fall out for trifles, like infidels? This was enough to pacify Lot, for Abraham to put him in mind that they were brethren; when he heard the name of brethren, straight his heart yielded, and the strife was ended. So this should be the lawyer to end quarrels between Christians, to call to mind that they are brethren. And they which have spent all at law have wished that they had taken this lawyer, to think, with Lot, whether it were meet for brethren to strive like enemies. —Henry Smith.