“But they said, Not on the feast day, lest there be an uproar among the people.”
King James Version (KJV)
26:5 But they said, Not at the feast - This was the result of human wisdom. But when Judas came they changed their purpose. So the counsel of God took place, and the true paschal Lamb was offered up on the great day of the paschal solemnity.
Mt 26:5 Not on the feast [day]. During the passover there were millions of Jews in Jerusalem. Josephus says that in A.D. 65, three million were present. There were often tumults at the passover, and it was feared that the arrest of Jesus would arouse one. On such occasions the Romans suppressed the disturbance without mercy.