Above suspicion
Definition:
This phrase is used to describe a person who is honest enough that no one would suspect.
The origin of the phrase is attributed to Julius Caesar, who divorced his wife Pompeia, on the grounds of her possible involvement in a public scandal, saying that "my wife ought not even to be under suspicion." This gave rise to a proverb, sometimes expressed: "Caesar's wife must be above suspicion."
Example:
That guy is a peaceful man; he is above suspicion.
