The Twenty-Third Psalm, from the Old Testament Book of Psalms, can be recited for a variety of purposes. Therefore, some consider it a multi-purpose prayer. As a prayer for those in mourning, it is often recited at funerals of both the Judaic and Christian faiths. It also gives courage to the fearful and hope to those who suffer from despair. Additionally, it is considered a prayer of protection against evil or demonic forces.
There are various English translations of the Twenty-Third Psalm, but almost all of them basically contain the following:
The Lord is my shepherd: I shall not want. He makes me lie down in green pastures; He leads me beside the still waters. He restores my soul. He leads me in the paths of righteousness for his name’s sake, and though I walk through the valley of the shadow of death, I will fear no evil for thou art with me. Thy rod and thy staff, they comfort me. You prepare a table before me in the presence of mine enemies; you anoint my head with oil; my cup overflows. Surely goodness and mercy will follow me all of the days of my life, and I will dwell in the house of the Lord forever.
Amen.