And the Lord came down in a cloud, and spoke to him, taking away of the spirit that was in Moses, and giving to the seventy men. And when the spirit had rested on them they prophesied, nor did they cease afterwards.

“This Spirit descended upon the seventy elders in Moses' day. My object is to prove that he knew all things and worked according to his will. The seventy elders were chosen: "The Lord then came down in the cloud, and taking some of the spirit that was on Moses, he bestowed it on the seventy elders." It was not that the Spirit was divided, but his gifts were distributed according to the vessels and the capacity of the recipients. Now there were sixty-eight present, and they prophesied. Eldad and Medad were not present. To make it clear that it was not Moses who bestowed the gift but the Spirit who wrought, Eldad and Medad, who had been called but had not yet presented themselves, also prophesied.”

“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).”

“And the Lord came down in a cloud,.... In a cloud of glory, or a glorious one, as the Targums; either in the same that went before the people in the wilderness, or in one distinct from it, and only used on this occasion, as a visible token of the presence of God: and spake unto him; to Moses, talked with him, as he said he would, Num 11:17, and took of the Spirit which was upon him, and gave it unto the seventy elders; See Gill on Num 11:17, and it came to pass that when the Spirit rested upon them they prophesied; either they sung the praises of God, which is sometimes the sense of prophesying, Ch1 25:1; blessing God for the honour done them, and the gift bestowed on them; or they opened and explained the laws of God, in virtue of the gifts they had received, according to which they were to assist Moses in the government of the people, or they foretold things come: the Jews say they prophesied of the quails, but that is not very likely: and did not cease; from prophesying; the spirit of prophecy continued with them, which, in some cases, might be necessary: or, they ceased not to prophesy all that day, though they afterwards did: and in the Hebrew text it is, "they added not" (q), that is, to prophesy, and Jarchi says they only prophesied that day, as it is interpreted in an ancient book of theirs, called Siphre: wherefore this spirit of prophecy is thought only to be given them as a temporary thing, for the confirmation of their having received the spirit of government, or gifts qualifying them for that, and to make them respectable among the people, and to show that they were appointed it by divine authority, and that this was not a device of Moses to ease himself. (q) "et non addiderunt", Pagninus, Montanus, Drusius; "et non am lin", Junius & Tremellius, Piscator.”

“Afterwards. Some give a contrary meaning to the Hebrew, with the Septuagint, Syriac, &c.: “They prophesied, (on that occasion) but they did not continue” to do so; except when they were favoured with the influence of the spirit. When it was requisite, they were enabled to declare God’s will and his praise to the people. (Calmet) — Saul is said to have prophesied when he praised God, 1 Kings x. 5, 10. (Menochius)”

“when the spirit rested upon them, they prophesied, and did not cease--As those elders were constituted civil governors, their "prophesying" must be understood as meaning the performance of their civil and sacred duties by the help of those extraordinary endowments they had received; and by their not "ceasing" we understand, either that they continued to exercise their gifts uninterruptedly the first day (see Sa1 19:24), or that these were permanent gifts, which qualified them in an eminent degree for discharging the duty of public magistrates.”