Gospel in the Old Testament

I was reading in Hebrews 4 and verse 2 we are told, "For we also have had the gospel preached to us, just as they did; but the message they heard was of no value to them, because those who heard did not combine it with faith." So the question is, How was the Gospel preached to those in the Old Testament? One way the Gospel was preached was through the Tabernacle. The walls, the courtyard, the coverings, the curtains, the furniture all spoke of the Redeemer. As we work through the Tabernacle over the next few weeks we will spend time looking at the way each aspect of the Tabernacle spoke of Jesus Christ.