Mark 14:12
On the first day of the Festival of Unleavened Bread, when it was customary to sacrifice the Passover lamb, his disciples asked him, where do you want us to go and make preparations for you to eat the Passover? — the Passover preparation is the Last Supper's setup. The Passover lamb was sacrificed on the afternoon of Nisan 14; the Passover meal was eaten that night (which began Nisan 15). The disciples' question about where generates the second detailed foreknowledge scene in the Jerusalem section.