Thomas the Apostle
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).