Rashi on Numbers 11:25/רש"י על במדבר י״א:כ״ה

1ולא 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).