Verse 5
He shall receive the blessing - Perhaps alluding to Obed-edom, at whose house the ark had been lodged, and on whom God had poured out especial blessings.
And righteousness - Mercy: every kind of necessary good. It is the mercy of God that crowns the obedience and fidelity of good men. For what made them good and faithful? God's mercy. What crowns their fidelity? God's mercy.