Thy precious Cross, O Christ God,
which Moses of old prefigured in his own person
when he overthrew Amalek and put him to flight;
which David commanded to be worshipped,
calling it Thy footstool:
this same Cross we sinners worship today with unworthy lips.
We praise Thee Who wast pleased to be nailed upon it,
and we cry to Thee:

“With the thief, make us worthy of Thy Kingdom, O Lord!”

Thy Cross, O Lord,
is life and resurrection for Thy people.
And we who put our trust in it
praise Thee, our God crucified in the flesh.
Have mercy on us!

Here is a good article by Patrick Henry Reardon about the Biblical passage referred to above, in which Moses interceded for the army of Israel as it did battle with the Amalekites: “The Best Intercessor in the Bible.”

“Moses conquered the Devil, wrote Gregory the Theologian,
‘by stretching out his hands upon the hill,
in order that the Cross, thus symbolized and prefigured,
might prevail.'”