Contradiction with 1 Corinthians 1:27
While Acts 8:9 describes Simon boasting of his greatness, 1 Corinthians 1:27 states that God chooses the foolish and weak to shame the wise and strong, contradicting the value of self-exaltation.
1 Corinthians 1:27: But God hath chosen the foolish things of the world to confound the wise; and God hath chosen the weak things of the world to confound the things which are mighty;
Contradiction with Proverbs 16:18
Acts 8:9 mentions Simon's self-proclaimed greatness, but Proverbs 16:18 warns that pride precedes destruction, highlighting the danger of boasting.
Proverbs 16:18: Pride [goeth] before destruction, and an haughty spirit before a fall.
Contradiction with Matthew 23:12
Acts 8:9 presents Simon exalting himself, yet Matthew 23:12 teaches that those who exalt themselves will be humbled, contradicting Simon's self-promotion.
Matthew 23:12: And whosoever shall exalt himself shall be abased; and he that shall humble himself shall be exalted.
Contradiction with Jeremiah 9:23-24
Acts 8:9 shows Simon boasting in his abilities, whereas Jeremiah 9:23-24 advises against boasting in wisdom, might, or riches and emphasizes understanding and knowing God.
Jeremiah 9:23-24: Thus saith the LORD, Let not the wise [man] glory in his wisdom, neither let the mighty [man] glory in his might, let not the rich [man] glory in his riches:
Contradiction with James 4:6
Acts 8:9 describes Simon as boasting about his own greatness, contrasting with James 4:6 which states that God resists the proud but gives grace to the humble.
James 4:6: But he giveth more grace. Wherefore he saith, God resisteth the proud, but giveth grace unto the humble.