The Blood of Jesus for Our Pardon Cries

Most people think that this blood is crying out for vengeance. In fact, the hymn I'm thinking of says that Abel's blood for vengeance pleaded to the skies, but the blood of Jesus for our pardon cries. And so he confronts Cain and they have this dialogue back and forth in which God is calling Cain to repentance. So as Abel's blood is soaking into the ground because of this murder done by his brother, at the same time this blood's voice is rising up to the ears of God.