Manifestations - Sins

Another feature of the life of a Manifestation of God which is essential for hiding His glory is that He lives in accordance with the laws and conventions of the society to which He belongs. He eats the same type of food, wears the same type of clothes and carries out the same customs as the rest of the people of His culture and background. He does not live in the pattern of the future society that will emerge centuries later as a result of His teachings and about which He has full knowledge. Circumstances of family life in Islamic countries were totally different from those of present-day Western society. The law of Islam concerning polygamy prevailed, allowing men to have a maximum of four wives at the same time.
(Adib Taherzadeh, The Child of the Covenant, p. 18)

Observe that if, according to the suppositions of the People of the Book,[1] the meaning were taken in its exoteric sense, it would be absolute injustice and complete predestination. If Adam sinned by going near the forbidden tree, what was the sin of the glorious Abraham, and what was the error of Moses the Interlocutor? What was the crime of Noah the Prophet? What was the transgression of Joseph the Truthful? What was the iniquity of the Prophets of God, and what was the trespass of John the Chaste? Would the justice of God have allowed these enlightened Manifestations, on account of the sin of Adam, to find torment in hell until Christ came and by the sacrifice of Himself saved them from excruciating tortures? Such an idea is beyond every law and rule and cannot be accepted by any intelligent person.
No; it means what has already been said: Adam is the spirit of Adam, and Eve is His soul; the tree is the human world, and the serpent is that attachment to this world which constitutes sin, and which has infected the descendants of Adam. Christ by His holy breezes saved men from this attachment and freed them from this sin. The sin in Adam is relative to His position. Although from this attachment there proceed results, nevertheless, attachment to the earthly world, in relation to attachment to the spiritual world, is considered as a sin. The good deeds of the righteous are the sins of the Near Ones. This is established. So bodily power is not only defective in relation to spiritual power; it is weakness in comparison. In the same way, physical life, in comparison with eternal life in the Kingdom, is considered as death. So Christ called the physical life death, and said: “Let the dead bury their dead."[2] Though those souls possessed physical life, yet in His eyes that life was death. This is one of the meanings of the biblical story of Adam. Reflect until you discover the others.
(‘Abdu’l-Bahá, Some Answered Questions, p. 125)
[1 Jews and Christians]
[2 Matt. 8:22]

This (the Manifestation’s) is a Station wherein no error or sin is found or spoken of.
(Bahá’í Scriptures, p. 241)