Numbers 9:4

וְיַעֲשׂוּ בְנֵי־יִשְׂרָאֵל אֶת־הַפָּסַח בְּמוֹעֲדֽוֹ

’Let the children of Israel keep the passover in its appointed season.

בְּאַרְבָּעָה עָשָֽׂר־יוֹם בַּחֹדֶשׁ הַזֶּה בֵּין הָֽעֲרְבַּיִם תַּעֲשׂוּ אֹתוֹ בְּמוֹעֲדוֹ כְּכָל־חֻקֹּתָיו וּכְכָל־מִשְׁפָּטָיו תַּעֲשׂוּ אֹתֽוֹ

In the fourteenth day of this month, at dusk, ye shall keep it in its appointed season; according to all the statutes of it, and according to all the ordinances thereof, shall ye keep it.’

וַיַּעֲשׂוּ אֶת־הַפֶּסַח בָּרִאשׁוֹן בְּאַרְבָּעָה עָשָׂר יוֹם לַחֹדֶשׁ בֵּין הָעַרְבַּיִם בְּמִדְבַּר סִינָי כְּכֹל אֲשֶׁר צִוָּה יְהוָה אֶת־מֹשֶׁה כֵּן עָשׂוּ בְּנֵי יִשְׂרָאֵֽל

And they kept the passover in the first month, on the fourteenth day of the month, at dusk, in the wilderness of Sinai; according to all that the LORD commanded Moses, so did the children of Israel.

וַיְהִי אֲנָשִׁים אֲשֶׁר הָיוּ טְמֵאִים לְנֶפֶשׁ אָדָם וְלֹא־יָכְלוּ לַעֲשֹׂת־הַפֶּסַח בַּיּוֹם הַהוּא וַֽיִּקְרְבוּ לִפְנֵי מֹשֶׁה וְלִפְנֵי אַהֲרֹן בַּיּוֹם הַהֽוּא

But there were certain men, who were unclean by the dead body of a man, so that they could not keep the passover on that day; and they came before Moses and before Aaron on that day.