Dip and sop... both is bread and not unleavened bread which can not handle dipping or sopping.
A sop is a piece of bread soaked in a liquid.
SOP - Wikipedia, the free encyclopedia
sop
Matthew 26:23
Jesus replied, “The one who has dipped his hand into the bowl with me will betray me.
Mark 14:20
“It is one of the Twelve,” he replied, “one who
dips bread into the bowl with me.
John 13:26
Jesus answered, “It is the one to whom
I will give this piece of bread when I have dipped it in the dish.” Then,
dipping the piece of bread, he gave it to Judas, the son of Simon Iscariot.
King James Bible (Cambridge Ed.)
Jesus answered, He it is, to whom
I shall give a sop, when I have dipped it. And when he had dipped the sop, he gave it to Judas Iscariot, the son of Simon.