Psalms 136:21

And gave their land for an heritage: for his mercy endureth for ever:

The words recall how God gave the lands of Sihon and Og as an inheritance to Israel His servant. They belong to a song of praise sung by the returned exiles after the captivity. In that song they hailed God as the same mighty leader who had acted for their fathers. They saw the enduring mercy that had once given Israel its land now shown again in bringing them back to it.