Mark 14:14

And wheresoever he shall enter in, say to the master of the house, The Teacher saith, Where is my guest-chamber, where I shall eat the passover with my disciples?

Eat the passover ... Christ, in this instruction, accommodated himself to the language of the disciples who had brought up the subject. Tradition has it that this was the home of John Mark, a not impossible thing, in view of Acts 12.