Ezekiel 45:19-20
19 The priest shall take some of the blood of the sin offering and put it on the doorposts of the temple, on the four corners of the ledge of the altar, and on the gateposts of the gate of the inner court. 20 And so you shall do on the seventh day of the month for everyone who has sinned unintentionally or in ignorance. Thus you shall make atonement for the temple.
19 The priest shall take some of the blood of the sin offering and put it on the doorposts of the temple, on the four corners of the ledge of the altar, and on the gateposts of the gate of the inner court. 20 And so you shall do on the seventh day of the month for everyone who has sinned unintentionally or in ignorance. Thus you shall make atonement for the temple.
Just as God passed over His people before freeing them from bondage in Egypt, so here He told the priest to mark the blood to pass over unintentional or unknowing sin. The entrance to the temple, the altar for atoning for sin, and the gate to the inner court nearer to God's presence - these all were so marked. So we are forgiven in Christ by His blood when we sin, as we draw near in worship or seeking forgiveness. His blood covers sufficiently.