The LORD has made known His salvation. His righteousness He has revealed in the sight of the nations. Psalm 98;2
Since the two disciples with hearts aflame returned from Emmaus to share what the Lord Jesus had taught them, the Church has diligently looked for the hidden, yet glorious revelation of Christ in the Old Testament scriptures. The Apostle Paul even declared that Christ was raised from the dead according to the [Old Testament] scriptures.
This verse undoubtedly points to the Cross, as it was there that the righteousness of God was on display, that all the world might see and believe.