Musar su Salmi 71:19

The popular expression says, “Be wary of charlatans and guard yourself against those of whom it is said ‘And your righteousness’ (Tehillim 71:19).” I have heard of another incident involving the only son of an extremely wealthy elderly man. This son was both handsome and wise and when his father saw that his death was approaching, he summoned him to give him his last instructions. “My son,” he told him, “I am bequeathing you much money and many other treasures. It should be sufficient for you to enjoy every good thing in the world throughout your entire life. But I warn you that you must be beware of charlatans and those who behave with greater piety than is normal for human beings. For it is the way of the charlatans to appear especially righteous, although they harbor in their hearts seven abominations. “And beware of those of whom it is said, ‘And your righteousness.’ Then you and your offspring will enjoy all manner of goodness all your days.”