2-chronicles 30:2

In the second month - In Ijar, as they could not celebrate it in Nisan, the fourteenth of which month was the proper time. But as they could not complete the purgation of the temple, till the sixteenth of that month, therefore they were obliged to hold it now, or else adjourn it till the next year, which would have been fatal to that spirit of reformation which had now taken place. The law itself had given permission to those who were at a distance, and could not attend to the fourteenth of the first month, and to those who were accidentally defiled, and ought not to attend, to celebrate the passover on the fourteenth of the second month; see Numbers 9:10, Numbers 9:11. Hezekiah therefore, and his counsellors, thought that they might extend that to the people at large, because of the delay necessarily occasioned by the cleansing of the temple, which was granted to individuals in such cases as the above, and the result showed that they had not mistaken the mind of the Lord upon the subject.

In the second month - Hezekiah and his counselors considered that the permission of the Law (see the marginal reference) might, under the circumstances, be extended to the whole people. It had been found impossible to complete the cleansing of the temple until the fourteenth day of the first month was past 2 Chronicles 29:17. It was, therefore, determined to defer it to the 14th of the second month, which allowed time for the priests generally to purify themselves, and for proclamation of the festival to be made throughout all Israel.

30:2 Second month - Which was against the common rule, but the doing of this in its proper time, namely, the fourteenth day of the first month was impossible, because the temple was not cleansed, nor they prepared.As there was a proviso in the law, that particular persons who were unclean in the first month, might keep the passover the fourteenth day of the second month, he doubted not but that might be extended by the whole congregation.