From Association of Independent Readers and Rootworkers
Hoodoo psychic readers, spirit workers and root doctors who recite Psalms on behalf of clients may work with Psalm 117 during
altar work and prayers for forgivness of sins. Psalm 117 is especially used when an oath or promise has been broken to help cleanse the client of faltering. If a client sets out to follow a particular commandment and they fail, then Psalm 117 is prayed to help cleanse them.
 O praise the LORD, all ye nations: praise him, all ye people.
 For his merciful kindness is great toward us: and the truth of the LORD endureth for ever. Praise ye the LORD.