Thematic Bible: Irregularities in

But He said to them, "Have you not read what David did when he became hungry, he and his companions, how he entered the house of God, and they ate the consecrated bread, which was not lawful for him to eat nor for those with him, but for the priests alone?

For the king and his princes and all the assembly in Jerusalem had decided to celebrate the Passover in the second month, since they could not celebrate it at that time, because the priests had not consecrated themselves in sufficient numbers, nor had the people been gathered to Jerusalem. Thus the thing was right in the sight of the king and all the assembly. read more.
So they established a decree to circulate a proclamation throughout all Israel from Beersheba even to Dan, that they should come to celebrate the Passover to the LORD God of Israel at Jerusalem. For they had not celebrated it in great numbers as it was prescribed.

For there were many in the assembly who had not consecrated themselves; therefore, the Levites were over the slaughter of the Passover lambs for everyone who was unclean, in order to consecrate them to the LORD. For a multitude of the people, even many from Ephraim and Manasseh, Issachar and Zebulun, had not purified themselves, yet they ate the Passover otherwise than prescribed. For Hezekiah prayed for them, saying, "May the good LORD pardon everyone who prepares his heart to seek God, the LORD God of his fathers, though not according to the purification rules of the sanctuary." read more.
So the LORD heard Hezekiah and healed the people.