John 13:28

Now no man at the table knew for what intent he spake this unto him. For some thought, because Judas had the bag, that Jesus said unto him, Buy what things we have need of for the feast, or, that he should give something to the poor.

Here is final and certain proof that the meal eaten was not the passover; otherwise, it would have been impossible for some of the disciples to have thought that Judas was being dispatched on an errand to buy things needed for its observance.

Or give something to the poor ... This affords an indirect glimpse of the habit of charity practiced by the apostles under Jesus' direction. The significance of this lies in the poverty of the group themselves. They, like Jesus, had nowhere to lay their heads, and sometimes they improvised lunch by plucking a few heads of wheat to eat as they crossed a field (Matthew 12:1); but, despite their own poverty, it was no unusual thing for them to give of their little store to those of even greater need.