Bamidbar 11:25

ולא יספו [AND THEY PROPHESIED] BUT DID NOT CONTINUE (to prophesy) — i. e. they prophesied only that day alone. Thus is the phrase explained in Siphre. Onkelos, however, rendered renders it ולא פסקין “and they did not cease”, meaning that the gift of prophecy never again departed from them (cf. Sanhedrin 17a and Rashi on Deuteronomy 5:19).

וַיֵּ֨רֶד יְהֹוָ֥ה ׀ בֶּעָנָן֮ וַיְדַבֵּ֣ר אֵלָיו֒ וַיָּ֗אצֶל מִן־הָר֙וּחַ֙ אֲשֶׁ֣ר עָלָ֔יו וַיִּתֵּ֕ן עַל־שִׁבְעִ֥ים אִ֖ישׁ הַזְּקֵנִ֑ים וַיְהִ֗י כְּנ֤וֹחַ עֲלֵיהֶם֙ הָר֔וּחַ וַיִּֽתְנַבְּא֖וּ וְלֹ֥א יָסָֽפוּ׃

And the Lord came down in a cloud, and spoke to him, and took of the spirit that was upon him, and gave it to the seventy elders: and it came to pass, that, when the spirit rested upon them, they prophesied, but continued not.