Psalmatic Spells of Protection
From Absit Omen Lexicon
Used almost exclusively by Jewish practitioners of priestly and Kabbalistic magic, the recitation of key words, phrases, or the psalms in their entirety can be used to protect the casters from offensive Dark magic. The quoted psalms are 61, 91, or 121 and are sometimes, though not always, prefaced by addressing Higher Powers.
The faith-based practise of Psalmatic spells is often discredited by agnostics and is academically is more commonly thought to function in a similar manner to the Patronus charm, which relies wholly on the spellcaster's ability to focus and gather is resolution and courage.