On any Saturday dated the thirteenth, students of the Gnostic tradition perform a special prayer to request the assistance of Melchisedec, the high priest who blessed Abraham, and whose order Jesus entered.
"And Melchizedek king of Salem brought out bread and wine: and he was [is] the priest of the most high God. And he blessed him, and said, "Blessed be Abram to the most high God, possessor of heaven and earth, And blessed be the most high God, which hath delivered thine enemies into thy hand". And he gave him tithe from all." — Genesis 14:18-20
"Jesus, — that is Aberamentho, — said: “Since indeed the father of my father, — that is Yew,— is the foreminder of all the rulers, Gods and powers who have arisen out of the matter of the Light of the Treasury, and Zorokothora Melchisedec is the envoy to all the lights which are purified in the rulers, leading them into the Treasury of the Light, — these two alone are the great Lights, and their ordinance is that they down go to the rulers and purify them, and that Zorokothora Melchisedec carrieth away the purification of the lights which they have purified in the rulers and leadeth them into the Treasury of the Light, — when the cipher and the time of their ordinance cometh, that they go down to the rulers and oppress and constrain them, carrying away the purification from the rulers." - The Pistis Sophia