John 20:26
“Reach hither your finger, and behold My hands; and reach hither your hand, and thrust it into My side”; He added,
“And be not faithless, but believing.”
Do you see that his doubt proceeded from unbelief? But it was before he had received the Spirit; after that, it was no longer so, but, for the future, they were perfected.
And not in this way only did Jesus rebuke him, but also by what follows; for when he, being fully satisfied, breathed again, and cried aloud,
Source: Homilies on the Gospel of John (New Advent)