1 Kings 2:30

Thus saith the king, Come forth: that the king gave him this command, though it be not mentioned before, is evident, both from the nature of the thing; for Solomon would not pollute the altar without necessity; and from Benaiah's affirmation of it; for why should he tell a lie without a cause? and from his return to the king for new orders upon Joab's resolution not to come thence. I will die here; for he supposed either that Solomon would not defile that place with his blood; or that he would spare him for his respect to it, as he had done Adonijah; or he had a superstitious conceit that his dying there might give his guilty and miserable soul some advantage.