Psalms 147:20

He hath not dealt so with any nation, that is, no heathen nation was chosen by Him in this same manner; and as for His judgments, the precepts of His divine justice, as laid down in His written Word, they have not known them. It was Israel's privilege to possess the historical, written revelation of the one true God, to this people alone were entrusted the oracles of the Lord, whose gist are the Messianic promises. Praise ye the Lord! "The joyful hallelujah is not sounded because these other nations do not possess such a positive knowledge of God's judgments, but because Israel does possess it. It is declared abundantly in other places that this knowledge of Israel shall be the means of making salvation the common property of the whole world of nations. " (Delitzsch.)