The scripture below was talking specifically about a bishop, but I think it could apply to anyone in a leadership position.
Titus 1:7-9 - "For an overseer, as God’s manager, must be blameless, not arrogant, not quick tempered, not addicted to wine, not a bully, not greedy for money, but hospitable, loving what is good, sensible, righteous, holy, self-controlled, holding to the faithful message as taught, so that he will be able both to encourage with sound teaching and to refute those who contradict it."