6 We begin the holy Easter feast on the tenth of Pharmuthi (April 5), desisting from the holy fasts on the fifteenth of the same month Pharmuthi (April 10), on the evening of the seventh day. And let us keep the holy feast on the sixteenth of the same month Pharmuthi (April 11); adding one by one [the days] till the holy Pentecost, passing on to which, as through a succession of feasts, let us keep the festival to the Spirit, Who is even now near us, in Jesus Christ, through Whom and with Whom to the Father be glory and dominion for ever and ever. Amen.
The fifteenth and sixteenth are wanting.
Source: Letters (New Advent)