A mediator is a person who helps two parties come to an agreement. Christ, as mediator, made it possible for a better covenant between God and humans to exist. See how you translated this phrase in [Hebrews 9:15](../09/15.md).
The blood of Jesus and the blood of Abel are spoken of as if they were people calling out. Alternate translation: "the sprinkled blood of Jesus that says better things than the blood of Abel" (See: [[rc://en/ta/man/translate/figs-personification]] and [[rc://en/ta/man/translate/figs-explicit]])