The Kitáb-i-Aqdas - The Most Holy Book
Index term: Sin
k34.
The kissing of hands hath been forbidden in the Book. This practice is prohibited by God, the Lord of glory and command. To none is it permitted to seek absolution from another soul; let repentance be between yourselves and God. He, verily, is the Pardoner, the Bounteous, the Gracious, the One Who absolveth the repentant.
k37.
Whoso layeth claim to a Revelation direct from God, ere the expiration of a full thousand years, such a man is assuredly a lying impostor. We pray God that He may graciously assist him to retract and repudiate such claim. Should he repent, God will, no doubt, forgive him. If, however, he persisteth in his error, God will, assuredly, send down one who will deal mercilessly with him. Terrible, indeed, is God in punishing! Whosoever interpreteth this verse otherwise than its obvious meaning is deprived of the Spirit of God and of His mercy which encompasseth all created things. Fear God, and follow not your idle fancies. Nay, rather, follow the bidding of your Lord, the Almighty, the All-Wise. Erelong shall clamorous voices be raised in most lands. Shun them, O My people, and follow not the iniquitous and evil-hearted. This is that of which We gave you forewarning when We were dwelling in 'Iráq, then later while in the Land of Mystery, and now from this Resplendent Spot.
k49.
God hath imposed a fine on every adulterer and adulteress, to be paid to the House of Justice: nine mithqáls of gold, to be doubled if they should repeat the offence. Such is the penalty which He Who is the Lord of Names hath assigned them in this world; and in the world to come He hath ordained for them a humiliating torment. Should anyone be afflicted by a sin, it behoveth him to repent thereof and return unto his Lord. He, verily, granteth forgiveness unto whomsoever He willeth, and none may question that which it pleaseth Him to ordain. He is, in truth, the Ever-Forgiving, the Almighty, the All-Praised.
k184.
Say: O source of perversion! Abandon thy willful blindness, and speak forth the truth amidst the people. I swear by God that I have wept for thee to see thee following thy selfish passions and renouncing Him Who fashioned thee and brought thee into being. Call to mind the tender mercy of thy Lord, and remember how We nurtured thee by day and by night for service to the Cause. Fear God, and be thou of the truly repentant. Granted that the people were confused about thy station, is it conceivable that thou thyself art similarly confused? Tremble before thy Lord and recall the days when thou didst stand before Our throne, and didst write down the verses that We dictated unto thee -- verses sent down by God, the Omnipotent Protector, the Lord of might and power. Beware lest the fire of thy presumptuousness debar thee from attaining to God's Holy Court. Turn unto Him, and fear not because of thy deeds. He, in truth, forgiveth whomsoever He desireth as a bounty on His part; no God is there but Him, the Ever-Forgiving, the All-Bounteous. We admonish thee solely for the sake of God. Shouldst thou accept this counsel, thou wilt have acted to thine own behoof; and shouldst thou reject it, thy Lord, verily, can well dispense with thee, and with all those who, in manifest delusion, have followed thee. Behold! God hath laid hold on him who led thee astray. Return unto God, humble, submissive and lowly; verily, He will put away from thee thy sins, for thy Lord, of a certainty, is the Forgiving, the Mighty, the All-Merciful.
n37.
backbiting or calumny
Backbiting, slander and dwelling on the faults of others have been repeatedly condemned by Bahá'u'lláh. In the Hidden Words, He clearly states: "O Son of Being! How couldst thou forget thine own faults and busy thyself with the faults of others? Whoso doeth this is accursed of Me." And again: "O Son of Man! Breathe not the sins of others so long as thou art thyself a sinner. Shouldst thou transgress this command, accursed wouldst thou be, and to this I bear witness." This strong admonition is further reiterated in His last work, "the Book of My Covenant": "Verily I say, the tongue is for mentioning what is good, defile it not with unseemly talk. God hath forgiven what is past. Henceforward everyone should utter that which is meet and seemly, and should refrain from slander, abuse and whatever causeth sadness in men."
n58.
To none is it permitted to seek absolution from another soul
Bahá'u'lláh prohibits confession to, and seeking absolution of one's sins from, a human being. Instead one should beg forgiveness from God. In the Tablet of Bishárát, He states that "such confession before people results in one's humiliation and abasement", and He affirms that God "wisheth not the humiliation of His servants".
Shoghi Effendi sets the prohibition into context. His secretary has written on his behalf that we

. . . are forbidden to confess to any person, as do the Catholics to their priests, our sins and shortcomings, or to do so in public, as some religious sects do. However, if we spontaneously desire to acknowledge we have been wrong in something, or that we have some fault of character, and ask another person's forgiveness or pardon, we are quite free to do so.

The Universal House of Justice has also clarified that Bahá'u'lláh's prohibition concerning the confession of sins does not prevent an individual from admitting transgressions in the course of consultations held under the aegis of Bahá'í institutions. Likewise, it does not preclude the possibility of seeking advice from a close friend or of a professional counsellor regarding such matters.
q11.
 
Question: If intercourse take place between a couple during their year of patience, and they become estranged again thereafter, must they recommence their year of patience, or may the days preceding the intercourse be included in the reckoning of the year? And once divorce hath taken place, is it necessary that a further period of waiting be observed?
Answer: Should affection be renewed between the couple during their year of patience, the marriage tie is valid, and what is commanded in the Book of God must be observed; but once the year of patience hath been completed and that which is decreed by God taketh place, a further period of waiting is not required. Sexual intercourse between husband and wife is forbidden during their year of patience, and whoso committeth this act must seek God's forgiveness, and, as a punishment, render to the House of Justice a fine of nineteen mithqáls of gold.
q47.
 
Question: Supposing that a man hath wed a certain woman believing her to be a virgin and he hath paid her the dowry, but at the time of consummation it becometh evident that she is not a virgin, are the expenses and the dowry to be repaid or not? And if the marriage had been made conditional upon virginity, doth the unfulfilled condition invalidate that which was conditioned upon it?
Answer: In such a case the expenses and the dowry may be refunded. The unfulfilled condition invalidateth that which is conditioned upon it. However, to conceal and forgive the matter will, in the sight of God, merit a bounteous reward.