Musar zu Jechezkiel 18:30

The twentieth principle is to cause the many to repent from iniquity to the extent of one's ability - as it is stated (Ezekiel 18:30), "Repent and make repent from all your transgressions." We learn [from this] that it is from the principles of repentance. And it is stated (Leviticus 19:17), "you shall surely reprimand your countryman and not bear sin because of him." We learn [from this] that if he does not rebuke him, he will be punished for [the other's] sins. And King David, peace be upon him, said in the psalm of repentance (Psalms 51:15), "I will teach transgressors Your ways, that sinners may return to You."

The twentieth principle of repentance is to cause multitudes to turn away from sin, as much as he is able, as it is said, "Return ye, and turn yourselves from all your transgressions" (Ezek. 18:30). We learn from this that this is one of the principles of true repentance. And it is said, "Thou shall not take vengeance, nor bear any grudge against the children of thy people" (Lev. 19:17). We have learned from this that if he does not rebuke him then he is guilty for the other's sin, and thus said David, "Then will I teach transgressors thy ways; and sinners shall return to thee" (Ps. 51:15).