Salmah bin Shbyb سلمة بن شبيب · The Book on Blood Money

that the Prophet (ﷺ) said: "Indeed, whoever kills a Mu'ahid that has a covenant from Allah and a covenant from His Messenger (ﷺ), then he has violated the covenant with Allah and the covenant of His Messenger, so he shall not smell the fragrance of Paradise; even though its fragrance can be sensed from the distance of seventy autumns."

from his father, from his grandfather, that the Prophet (ﷺ) imprisoned a man for an accusation, then he let him go.