This is a magical invocation written by John Dee. As far as I can tell it was originally in Latin and comes from a work entitled Tabula Bonorum Angelorum Invocationes, otherwise known as “The Book of Invocations or Calls” or “The Book of Supplications Or Invocations.” Its full title is “Fundamental Supplication to God, and Entreaty for having the benign ministry of the Good Angels.”
O YHVH TzABAOTh, we invoke and implore most earnestly your Divine Power, Wisdom and Goodness, and most humbly and faithfully ask you to favor and assist us in all our works, words and cogitations, concerning, promoting or procuring your praise, honor and Glory. And by these your twelve mystical names:
ORO, IBAH, AOZPI, MOR, DIAL, HCTGA, OIP, TEAA, PDOCE, MPH, ARSL, GAIOL,
Most ardently do we entreat and implore your Divine and Omnipotent Majesty: that all your faithful Angelic Spirits whose mystical names are expressed in this book and whose offices are briefly noted, in whatever part of the world they be and, in whatever time of our lives they are summoned by us by means of their peculiar powers or authority of your Holy Names (likewise contained in this book), that most swiftly they come to us visible, affable, and appear to us peacefully and remain with us visibly according to our wishes, and that they disappear at our request from us and from our sight. And through you and that reverence and obedience which they owe you in those twelve mystical names above mentioned, that they give satisfaction amicably to us also, at each and every moment in our lives, and in each and every deed or request to all, some or one of them, and to do this quickly, well, completely and perfectly to discharge, perfect and complete all this according to their virtues and power both general and individual and through the injunctions given them by you (O God) and their charged offices and ministry. AMEN.