8 We begin the fast of forty days on the thirteenth of Phamenoth (9 Mar.), and the holy week of Easter on the eighteenth of Pharmuthi (Apr. 13); and resting on the seventh day, being the twenty-third (Apr. 18), and the first of the great week having dawned on the twenty-fourth of the same month Pharmuthi (Apr. 19), let us reckon from it till Pentecost. And at all times let us sing praises, calling on Christ, being delivered from our enemies by Christ Jesus our Lord, through Whom to the Father be glory and dominion for ever and ever. Amen. Greet one another with a holy kiss. All those who are here with me salute you. I pray, my beloved brethren, that you may have health in the Lord.
He wrote this also from Rome. Here ends the thirteenth Letter.
Source: Letters (New Advent)