Trespassing

Do not enter a house in the absence of its owner except with his permission

"Take heed that ye enter no house in the absence of its owner, except with his permission. Comport yourselves with propriety under all conditions, and be not numbered with the wayward."

(Bahá'u'lláh, Kitáb-i-Aqdas, par. 145)

"Entering a house without the owner's permission"

(Shoghi Effendi?, Synopsis and Codification of the Kitáb-i-Aqdas, "IV. LAWS, ORDINANCES AND EXHORTATIONS", "D. Miscellaneous Laws, Ordinances and Exhortations ", "1. Miscellaneous Laws and Ordinances:", "y. Prohibitions", no. xxvi)

God is clear of those who enter a house without leave of its owner unless they repent and return to God

"They that spread disorder in the land, and lay hands on the property of others, and enter a house without leave of its owner, We, verily, are clear of them, unless they repent and return unto God, the Ever-Forgiving, the Most Merciful."

(Bahá'u'lláh, Epistle to the Son of the Wolf, p. 23)

No man to enter house of his friend except at his friend's pleasure

"O MY FRIENDS! Walk ye in the ways of the good pleasure of the Friend, and know that His pleasure is in the pleasure of His creatures. That is: no man should enter the house of his friend save at his friend's pleasure, nor lay hands upon his treasures nor prefer his own will to his friend's, and in no wise seek an advantage over him. Ponder this, ye that have insight!"

(Bahá'u'lláh, Hidden Words, from the Persian, no. 43