Adam and Eve ate the forbidden fruit. Adam then blamed Eve who blamed the serpent. (Genesis 3)
Noah became drunk after he left the ark and had planted a vineyard. (Genesis 9)
Abraham lied twice about his wife Sarah, each time claiming that Sarah was merely his sister. (Genesis 12 & 20)
Lot had an incestuous relationship with his two daughters. (Genesis 19)
Jacob played a trick on Isaac in order to get the birthright blessing. (Genesis 27)
Aaron built a golden calf for idol worship. (Exodus 32)
Miriam had a bout of leprosy as punishment for gossiping about Moses’ wife. (Numbers 12)
Moses was not allowed to cross into the Promised Land because he was disrespectful to the Lord when he drew water from the rock at Meribah. (Numbers 20:8-12)
Gideon made an “ephod” out of the gold won in battle, which caused the whole of Israel again to turn away from God. (Judges 8:26-27)
Jonah at first refused to go to Ninevah. So he was swallowed by a whale. (Jonah 1)
David sinned with Bathsheba. (2 Samuel 11)
Solomon worshiped the gods of his wives. (1 Kings 11)
Elijah was depressed and asked God to let him die. (1 Kings 19)
Job cursed his own birth. (Job 3)
King Hezekiah showed his treasures to the ambassadors from Babylon. Isaiah then prophesied: Behold, the days come, that all that is in thine house, and that which thy fathers have laid up in store until this day, shall be carried to Babylon: nothing shall be left, saith the Lord. (Isaiah 39)
Zacharias was struck dumb because he doubted the angel Gabriel’s message that he, Zacharias, would be the father of John the Baptist. (Luke 1)
Mary Magdalene was possessed by seven demons before Jesus cleansed her. (Luke 8:2)
Martha complained to Jesus that her sister Mary was unhelpful with housework. (Luke 10:38-42)
Peter denied knowing Christ three times. (Mark 14)
Nathaniel questioned: Can there any good thing come out of Nazareth? (John 1:46)
Thomas doubted that Jesus had been resurrected. (John 20)
Paul (Saul) held the coats of the men who stoned Stephen. (Acts 6)
John Mark left Paul and the other missionaries who were traveling to Asia Minor, and he returned to Jerusalem. This caused a break between Paul and Barnabas some time later. (Acts 13 & 15)
Paul confessed:
For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.
For the good that I would I do not: but the evil which I would not, that I do.
(Romans 7:15,19)
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Rabbi Saadiah Gaon, in his Book of Beliefs and Opinions, explains that God deliberately chooses human prophets whose mortal nature is apparent, so that people will not ascribe the miracles they perform to themselves, but rather to God.