Moab is My washpot… – Psalm 60:8

When you see the wickedness of an ungodly man, make him your washpot, by remembering that you also, though you are regenerate, are encompassed with “the body of this death.” Remember the words of the Apostle: “For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not. For the good that I would I do not: but the evil which I would not, that I do. I find then a law, that, when I would do good, evil is present with me. For I delight in the law of God after the inward man: but I see another law in my members, warring against the law of my mind, and bringing me into captivity to the law of sin which is in my members.” The old nature so remains in us, that, if we were to be deserted by God, we should even yet become such as the ungodly are. Need I quote to you the speech of John Bradford, one of the godliest of men? When he saw a wretch taken out to Tyburn to be hanged, the tears were in his eyes, and when they asked him why, he said, “There goes John Bradford, but for the grace of God.” Ah, and when we see a prodigal plunging into excess of riot, there goes the best among us, if we are not preserved in Christ Jesus. Ay, and when the damned go down to hell, there must I go, unless the same grace which restrains me now from sin, shall uphold me to my last day; and keep me from falling. Brother Christian, you carry much combustible matter in your nature, be warned when you see your neighbour’s house on fire. When one man falls, the next should look to his steps. You are a man of like passions, remember yourself, lest you also be tempted…So when we see a sinner transgressing, we should say to ourselves, “I also am a man, and a fallen man, let me abhor every evil way, and guard myself jealously, lest I also fall into sin.” In this way Moab may be a washpot. By remembering what we are, and what we were, we may, by taking warning from the evil courses of others, avoid the like condemnation. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0983.cfm