The other disciples therefore said unto him, We have seen the Lord. But he said unto them, Except I shall see in his hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into his side, I will not believe.
The other disciples therefore said to him, "We have seen the Lord!" But he said to them, "Unless I see in his hands the print of the nails, and put my hand into his side, I will not believe."
The disciples kept telling (Greek imperfect word: elegon, in the sense of "attempted to tell"[2]) their vision of Jesus ("We have seen the Lord"), just like what Mary did in John 20:18.[3]
Thomas has shown his difficulties to understand Jesus in John 11:16 and John 14:15, and this time he hesitated
when confronted with the resurrection account.[3] Thomas' emphatic disbelief of the disciples' testimony intensified his resolution to seek physical evidence to convince him that the risen Jesus was the Jesus he had known.[4]
This part has a parallel in Luke 24:39.[5]
The palpable marks (Greek: typos) – the 'print of the nails' in Jesus' hands and the pierced hole on his side (John 19:34)[6] – provide 'apologetic function' for the readers of the gospel.[3]
^Köstenberger, Andreas J. (2004). John. Baker Exegetical Commentary on the New Testament. Vol. 4 (illustrated ed.). Baker Academic. p. 576. ISBN9780801026447.