Almighty and eternal God,
who, for the firmer foundation of our faith,
allowed your holy apostle Thomas to doubt the resurrection of your Son
till word and sight convinced him:
grant to us, who have not seen, that we also may believe
and so confess Christ as our Lord and our God;
who is alive and reigns with you,
in the unity of the Holy Spirit,
one God, now and for ever.
1 Peter 1.3-12
2 Samuel 15.17-21 or Ecclesiasticus 2
Psalms 92, 146
Common of Apostles and Evangelists (here).