The resurrected Jesus appears to His disciples and other people, and has some trouble convincing them who He is, then he has breakfast with Peter and colleagues after they go fishing, then He goes to heaven (the Ascension): Luke 24:13–43; Mark 16:12–14; John 20:19–21:25; Matthew 28:16–20; Mark 16:15–20; Luke 24:44–53; Acts 1:1–11
Not everyone was convinced Jesus was alive. More than once, the resurrected Jesus needed to show the holes in His hands and feet to prove it was Him rather than some dopplegänger trying to fool them by impersonating their beloved teacher.
John 20:20 As He spoke, He showed them the wounds in His hands and his side. They were filled with joy when they saw the Lord!
Thomas missed this show-and-tell the first time. He asked for the same ‘proof’, and for that, he forever carries the label Doubting Thomas. It might be fairer to call him Thomas who wasn’t there, or Thomas who believed it when he saw it.
John 20:24-28 But [Thomas] replied, ‘I won’t believe it unless I see the nail wounds in his hands, put my fingers into them, and place my hand into the wound in his side.’ … 27 Then [Jesus] said to Thomas, ‘Put your finger here, and look at my hands. Put your hand into the wound in my side. Don’t be faithless any longer. Believe!’
‘My Lord and my God!’ Thomas exclaimed. Then Jesus told him, ‘You believe because you have seen me. Blessed are those who believe without seeing me.’