- Evidence that Moses and Elijah were called 'robbers':
All who have come before me are thieves and robbers
(John 10:8)
...but to sit at my right or left is not for me to grant. These places belong to those for whom they have been prepared.”
(Mark 10:40)
Mark knew an obscure tradition that had the crucifixion, in outer space, of the demons themselves who had crucified Jesus, as punition for having them crucified the Lord of Glory.
Colossians 2:14-15
14 having canceled the charge of our legal indebtedness, which stood against us and condemned us; he has taken it away, nailing it to the cross. And having disarmed the powers and authorities, he made a public spectacle of them, triumphing over them by the cross.
The anti-demiurgists identified those demons with the Law and the Prophets, i.e. Moses and Elijah.
So Mark neutralized that anti-demiurgist tradition by having the demons (= Moses and Elijah) not crucified in heaven, but conversing pacifically with Jesus during the Transfiguration.
What was left was the memory of crucified demons who hated the Lord of Glory because the former had been deceived by the latter.
So Mark neutralized also that tradition by having the two crucified robbers insulting Jesus on the cross.
Those crucified with him also heaped insults on him.
(Mark 15:32)
I think that Mark has been not entirely able to eclipse what he wanted to eclipse: the memory of a celestial crucifixion of Jesus that, as effect, implied the celestial crucifixion of the demons who had given the Law.