TSK · Numbers 9:11

They shall eat the flesh in that night, roasted with fire, and unleavened bread. They shall eat it with bitter herbs.

On the fourteenth day of this month, at evening, you shall keep it in its appointed season--according to all its statutes, and according to all its ordinances, you shall keep it."

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