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 3 to protect against enemies or during
altar work and prayers for a client who has a severe headache or back pain. This psalm is a plea for an end to or a reversal of pain and a restoration of health to the head and neck. It is common for a hoodoo conjure doctor to recite Psalm 3 during spell-casting while anointing the affected parts with Holy Oil.
A Psalm of David, when he fled from Absalom his son.
 LORD, how are they increased that trouble me! many are they that rise up against me.
 Many there be which say of my soul, There is no help for him in God. Selah.
 But thou, O LORD, art a shield for me; my glory, and the lifter up of mine head.
 I cried unto the LORD with my voice, and he heard me out of his holy hill. Selah.
 I laid me down and slept; I awaked; for the LORD sustained me.
 I will not be afraid of ten thousands of people, that have set themselves against me round about.
 Arise, O LORD; save me, O my God: for thou hast smitten all mine enemies upon the cheek bone; thou hast broken the teeth of the ungodly.
 Salvation belongeth unto the LORD: thy blessing is upon thy people. Selah.