We hear this prayer for the first time this year at the Presanctified Liturgy:
Prayer before the Ambo
Bishop on an ambo - Elevation of the Precious Cross (Menologion of Basil II, c. 1000 A.D.)
O Almighty Master, who in wisdom hast fashioned all creation; who, through thine ineffable providence and great goodness, hast led us to these all-revered days for purification of souls and bodies, for restraint of passions, and for hope of the Resurrection; who, during the forty days, didst put into the hands of thy servitor Moses the tables in letters divinely inscribed: grant unto us also, O Good One, to fight the good fight, to complete the course of the Fast, to preserve the Faith undivided, to crush the heads of invisible serpents, to be shown to be conquerors of sins and, without condemnation, also to attain to and to worship the holy Resurrection. For blessed and glorified is thine all-honorable and majestic name; of the Father, and of the Son, and of the Holy Spirit, now and ever and unto ages of ages. Amen.
Moses receiving and giving the Law (Illuminated Psalter, Vatopedi MS 761, 1087-88 A.D.)