The Kitáb-i-Aqdas - The Most Holy Book
Index term: Transgression(s)
k29.
Say: This is that hidden knowledge which shall never change, since its beginning is with nine, the symbol that betokeneth the concealed and manifest, the inviolable and unapproachably exalted Name. As for what We have appropriated to the children, this is a bounty conferred on them by God, that they may render thanks unto their Lord, the Compassionate, the Merciful. These, verily, are the Laws of God; transgress them not at the prompting of your base and selfish desires. Observe ye the injunctions laid upon you by Him Who is the Dawning-place of Utterance. The sincere among His servants will regard the precepts set forth by God as the Water of Life to the followers of every faith, and the Lamp of wisdom and loving providence to all the denizens of earth and heaven.
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.
k143.
He [The Báb] hath previously made known unto you that which would be uttered by this Dayspring of Divine wisdom. He said, and He speaketh the truth: "He [Bahá'u'lláh] is the One Who will under all conditions proclaim: 'Verily, there is none other God besides Me, the One, the Incomparable, the Omniscient, the All-Informed.'" This is a station which God hath assigned exclusively to this sublime, this unique and wondrous Revelation. This is a token of His bounteous favour, if ye be of them who comprehend, and a sign of His irresistible decree. This is His Most Great Name, His Most Exalted Word, and the Dayspring of His Most Excellent Titles, if ye could understand. Nay more, through Him every Fountainhead, every Dawning-place of Divine guidance is made manifest. Reflect, O people, on that which hath been sent down in truth; ponder thereon, and be not of the transgressors.
k155.
Gambling and the use of opium have been forbidden unto you. Eschew them both, O people, and be not of those who transgress. Beware of using any substance that induceth sluggishness and torpor in the human temple and inflicteth harm upon the body. We, verily, desire for you naught save what shall profit you, and to this bear witness all created things, had ye but ears to hear.
k162.
Were He to decree as lawful the thing which from time immemorial had been forbidden, and forbid that which had, at all times, been regarded as lawful, to none is given the right to question His authority. Whoso will hesitate, though it be for less than a moment, should be regarded as a transgressor.
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.
n175.
The Lord hath relieved you . . . of the restrictions that formerly applied to clothing and to the trim of the beard.
Many rules about dress had their origins in the laws and traditional practices of the world's religions. For example, the Shí'ih clergy adopted for themselves a distinctive headdress and robes and, at one time, forbade the people to adopt European attire. Muslim practice, in its desire to emulate the custom of the Prophet, also introduced a number of restrictions with regard to the trim of the moustache and the length of the beard.
Bahá'u'lláh removed such limitations on one's apparel and beard. He leaves such matters to the "discretion" of the individual, and at the same time calls upon the believers not to transgress the bounds of propriety and to exercise moderation in all that pertains to dress.
q94.
 
Question: Concerning mosques, chapels and temples.
Answer: Whatever hath been constructed for the worship of the one true God, such as mosques, chapels and temples, must not be used for any purpose other than the commemoration of His Name. This is an ordinance of God, and he who violateth it is verily of those who have transgressed. No harm attacheth to the builder, for he hath performed his deed for the sake of God, and hath received and will continue to receive his just reward.