כִּ֣י לֹ֧א יָכְל֛וּ לַעֲשֹׂת֖וֹ בָּעֵ֣ת הַהִ֑יא כִּ֤י הַכֹּהֲנִים֙ לֹֽא־הִתְקַדְּשׁ֣וּ לְמַדַּ֔י וְהָעָ֖ם לֹא־נֶאֶסְפ֥וּ לִֽירוּשָׁלִָֽם׃
Denn sie konnten es damals nicht behalten, weil sich die Priester nicht in ausreichender Zahl geheiligt hatten und sich das Volk auch nicht nach Jerusalem versammelt hatte.
Rashi on II Chronicles
For they could not perform it at that time in the first month, in Nissan.
Rashi on II Chronicles
for the priests had not consecrated themselves sufficiently They had not consecrated themselves sufficiently for Israel to offer their Passover sacrifices, and it goes without saying that they could not perform it in Nissan, for they did not finish consecrating the Temple until the sixteenth of Nissan, but this is its meaning: For they could not perform it at that time; i.e., even if they had not delayed the purification of the Temple, which they did not complete until the sixteenth of Nissan, they would not have been able to perform it now [the offering of the Passover sacrifice] because not enough priests had consecrated themselves.
Rashi on II Chronicles
and the people had not gathered all of them [had not] yet [gathered] to Jerusalem.