Strong's Hebrew English Morphology 3588 [e] כִּ֣י kî For Conj 3808 [e] לֹ֧א lō not Adv-NegPrt 3201 [e] יָכְל֛וּ yā-ḵə-lū they could V-Qal-Perf-3cp 6213 [e] לַעֲשֹׂת֖וֹ la-‘ă-śō-ṯōw keep it Prep-l | V-Qal-Inf | 3ms 6256 [e] בָּעֵ֣ת bā-‘êṯ at time Prep-b, Art | N-cs 1931 [e] הַהִ֑יא ha-hî; that Art | Pro-3fs 3588 [e] כִּ֤י kî because Conj 3548 [e] הַכֹּהֲנִים֙ hak-kō-hă-nîm priests Art | N-mp 3808 [e] לֹֽא־ lō- not Adv-NegPrt 6942 [e] הִתְקַדְּשׁ֣וּ hiṯ-qad-də-šū had consecrated themselves V-Hitpael-Perf-3cp 1767 [e] לְמַדַּ֔י lə-mad-day, a sufficient number Prep-l, Prep-m | N-ms 5971 [e] וְהָעָ֖ם wə-hā-‘ām and the people Conj-w, Art | N-ms 3808 [e] לֹא־ lō- not Adv-NegPrt 622 [e] נֶאֶסְפ֥וּ ne-’es-p̄ū had gathered together V-Nifal-Perf-3cp 3389 [e] לִֽירוּשָׁלִָֽם׃ lî-rū-šā-lim. at Jerusalem Prep-l | N-proper-fs

New American Standard Bible
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.

King James Bible
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.

Holman Christian Standard Bible
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.

at that time

Exodus 12:6,18 And you shall keep it up until the fourteenth day of the same month…

because

2 Chronicles 29:34 But the priests were too few, so that they could not flay all the …

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