TSK · Numbers 9:11

And they shall eat the flesh in that night, roast with fire, and unleavened bread; [and] with bitter [herbs] they shall eat it.

In the fourteenth day of this month, at even, ye shall keep it in his appointed season: according to all the rites of it, and according to all the ceremonies thereof, shall ye keep it.

For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month.