ESV: for they could not keep it at that time because the priests had not consecrated themselves in sufficient number, nor had the people assembled in Jerusalem—
NIV: They had not been able to celebrate it at the regular time because not enough priests had consecrated themselves and the people had not assembled in Jerusalem.
NASB: 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.
CSB: because they were not able to observe it at the appropriate time. Not enough of the priests had consecrated themselves, and the people hadn't been gathered together in Jerusalem.
NLT: They were unable to celebrate it at the prescribed time because not enough priests could be purified by then, and the people had not yet assembled at Jerusalem.
KJV: For they could not keep it at that time, because the priests had not sanctified themselves sufficiently, neither had the people gathered themselves together to Jerusalem.
NKJV: For they could not keep it at the regular time, because a sufficient number of priests had not consecrated themselves, nor had the people gathered together at Jerusalem.
