A doubting Thomas is a skeptic who refuses to believe without direct personal experience – a reference to the Gospel of John's depiction of the Apostle Thomas, who, in John's account, refused to believe the resurrected Jesus had appeared to the ten other apostles until he could see and feel Jesus's crucifixion wounds.
In art, the episode (formally called the Incredulity of Thomas) has been frequently depicted since at least the 15th century, with its depiction reflecting a range of theological interpretations.