Psalms 136:22

Even an heritage unto Israel his servant: for his mercy endureth for ever.

The heritage given to Israel as God's servant was the territory of great and renowned kings whom He struck down, namely Sihon king of the Amorites and Og king of Bashan. That gift stands as proof that His mercy continues forever. When the exiles returned from captivity and laid the foundation stone of the second temple, they sang of this heritage with priests sounding trumpets and the sons of Asaph playing cymbals. In that song they praised Him as the Mighty Leader of the hosts of Israel for His merciful providences exercised in their behalf.