The Prayer before the Conjurations (Key of Solomon, Book I, ch. 5)
S. L. MacGregor Mathers (trans. & ed.), The Key of Solomon the King (Clavicula Salomonis), London: George Redway, 1889, Book I, chapter V, 'Prayers and Conjurations'
O LORD God, Holy Father, Almighty and Merciful One, Who hast created all things, Who knowest all things and can do all things, from Whom nothing is hidden, to Whom nothing is impossible; Thou Who knowest that we perform not these ceremonies to tempt Thy power, but that we may penetrate into the knowledge of hidden things; we pray Thee by Thy Sacred Mercy to cause and to permit that we may arrive at this understanding of secret things, of whatever nature they may be, by Thine aid, O Most Holy ADONAI, Whose Kingdom and Power shall have no end unto the Ages of the Ages. Amen.
The Prayer being finished, let the Exorcist lay his hand upon the Pentacles, while one of the Disciples shall hold open before him the Book wherein are written the prayers and conjurations proper for conquering, subduing, and reproving the Spirits. Then the Master, turning towards each Quarter of the Earth, and raising his eyes to Heaven, shall say:
O Lord, be Thou unto me a strong tower of refuge, from the sight and assaults of the Evil Spirits.
After which let him turn again towards the Four Quarters of the Earth, and towards each let him utter the following words:
Behold the Symbols and Names of the Creator, which give unto ye for ever Terror and Fear. Obey then, by the virtue of these Holy Names, and by these Mysteries of Mysteries.