Numbers 32:23

23.But if ye will not do so. He makes a solemn protestation that they will deal wickedly, if they break their promise: and at the same time denounces punishment against them, as if he were summoning them before the tribunal of God. But, although he speaks conditionally of that particular engagement, whereby the two tribes had voluntarily bound themselves, still we may derive from his words the general doctrine, that, unless we abide by our promises, God will always be the avenger of fraud and treachery. The expression, “Sin will find you out,” is more emphatic than as if he had simply said, You shall not escape God’s hand; for the meaning of it is that vengeance is so connected with sin, that it cannot be severed from it. Thus, in Genesis 4:7, it is said, “Sin lieth at the door,” to lay hold at length of the guilty. For, such is our propensity to sin, that we too often find from experience that we are encouraged to audacity by God’s forbearance, whilst we think that we have escaped, if He makes as though He saw us not for a time.