“On the first day

Of the Unleavened Bread,

When the Passover lamb

Is sacrificed,

His disciples

Said to him.

‘Where do you want

Us to go

And make

The preparations

For you

To eat

The Passover?’”

Καὶ τῇ πρώτῃ ἡμέρᾳ τῶν ἀζύμων, ὅτε τὸ πάσχα ἔθυον, λέγουσιν αὐτῷ οἱ μαθηταὶ αὐτοῦ Ποῦ θέλεις ἀπελθόντες ἑτοιμάσωμεν ἵνα φάγῃς τὸ πάσχα;

This is similar to Matthew, chapter 26:17, and Luke, chapter 22:7-8, but in Luke, Jesus was speaking to Peter and John explicitly.  All three synoptic gospel writers said that this was the 1^st day of the Unleavened Bread (Καὶ τῇ πρώτῃ ἡμέρᾳ τῶν ἀζύμων).  Mark explained that the Passover lamb was sacrificed then (ὅτε τὸ πάσχα ἔθυον), but Matthew did not feel the need to explain that to his Jewish Christian readers.  Some unnamed disciples spoke to Jesus (λέγουσιν αὐτῷ οἱ μαθηταὶ αὐτοῦ).  They wanted to know where Jesus wished that they prepare to eat the Passover meal amonst themselves (Ποῦ θέλεις ἀπελθόντες ἑτοιμάσωμεν ἵνα φάγῃς τὸ πάσχα).  At that time, it was the custom to go to Jerusalem to eat the Passover, not in their homes as later, after the destruction of the Temple.  The question of whether this was the Passover or the day before the Passover seems somewhat moot, since this was the 1^st day of the Unleavened Bread, when they ate the matzah bread, the Hebrew word for unleavened bread.  The Passover meal itself usually included a lamb.