Atonement in Judaism is the process of causing a transgression to be forgiven or pardoned.
In the Hebrew Bible the idea of atonement (Hebrew kaphoreth) is connected with "covering."
In Rabbinic Judaism, atonement is achieved through repentance, which can be followed by some combination of
Which of these additions are required varies according to the severity of the sin, whether it was done willfully, in error, or under duress, whether it was against God alone or also against a fellow person, and whether the Temple service and ordained law courts are in existence or not. Repentance is needed in all cases of willful sin, and restitution is always required in the case of sin against a fellow person, unless the wronged party waives it.
The following table, based on Maimonides (Hil. Teshuva 1:1-4), gives an outline of the requirements for atonement in sins between man and God:
The sentence of an ordained court (when available) can also substitute for Yom Kippur + tribulations + dying. It is important to note that once a person has repented, he can be close to and beloved of God, even if his atonement is not yet complete (ibid. 7:7).
The Mishnah states, "To a man who says, 'I will sin and repent, I will sin and repent', Yom Kippur brings no atonement. For sins against God, Yom Kippur brings atonement. For sins against one's fellow man, Yom Kippur brings no atonement until he has become reconciled with the fellow man he wronged.
According to Maimonides, in order to achieve true repentance the sinner must abandon his sin, remove it from his thoughts, and resolve in his heart never to repeat it, as it is said, “Let the wicked forsake his way and the man of iniquity his thoughts" (Isaiah 55:7). Likewise, he must regret the past, as it is said, "Surely after I turned I repented" (Jeremiah 31:18). He must also call Him who knows all secrets to witness that he will never return to this sin again.
The third chapter of tractate Makkot enumerates fifty-nine offenses, each entailing lashes. Of these, three are marital sins of priests; four, prohibited inter-marriages; seven, sexual relations of an incestuous nature; eight, violations of dietary laws; twelve, various violations of the negative precepts; twenty-five, abuses of Levitical laws and vows. When the offense has been persisted in, the punishment depends on the number of forewarnings (see Hatra'ah). The Mishnah gives thirty-nine as the maximum number of stripes the court may impose for any one misdemeanor; but the convict must be examined as to his physical ability to endure the full count without endangering his life. The convict is bound in bent position to a post, and the public executioner administers the punishment with a leather strap while one of the judges recites appropriate Scriptural verses (Deut. xxviii. 15, 29; xxix. 8; Ps. lxxviii. 38). Any one guilty of a sin which is punished by Kareth ("excision") may be cleared by flagellation. The author of this midrash, Ḥanina b. Gamaliel, adds, "If by the commission of a sin one forfeits his soul before God, so much the more reason is there for the belief that, by a meritorious deed, such as voluntary submission to punishment, his soul is saved."