In observing the Jewish Passover, Jesus may have been recalling the betrayal of Joseph in the Old Testament by his brothers.
The Last Supper celebrated by Jesus and his disciples is linked to the Jewish Passover celebration, which contains a variety of symbolic acts.
During this meal, Jesus proclaims that one of his disciples will betray him.
Why did Jesus dip a "morsel" and give it to Judas?
There are many different interpretations of this act, but one possibility is that Jesus was performing a part of the Jewish Passover that recalls the betrayal of Joseph in the Old Testament.
This is what D.T. Lancaster suggests in his article, "Last Seder: A Jewish Reading of the Last Supper."
Shlomo Riskin also explains this ritual for an article on Israel Times.
Everything in the Gospel is there for a reason, even a small minute detail of Jesus dipping a piece of food and giving it to Judas.
