וַיִּשָּׁאֲר֣וּ שְׁנֵֽי־אֲנָשִׁ֣ים ׀ בַּֽמַּחֲנֶ֡ה שֵׁ֣ם הָאֶחָ֣ד ׀ אֶלְדָּ֡ד וְשֵׁם֩ הַשֵּׁנִ֨י מֵידָ֜ד וַתָּ֧נַח עֲלֵיהֶ֣ם הָר֗וּחַ וְהֵ֙מָּה֙ בַּכְּתֻבִ֔ים וְלֹ֥א יָצְא֖וּ הָאֹ֑הֱלָה וַיִּֽתְנַבְּא֖וּ בַּֽמַּחֲנֶֽה׃
Y habían quedado en el campo dos varones, llamado el uno Eldad y el otro Medad, sobre los cuales también reposó el espíritu: estaban estos entre los escritos, mas no habían salido al tabernáculo; y profetizaron en el campo.
Abarbanel
The fifteenth question pertains to the statement, 'Would that all the people of the Lord were prophets.' Onkelos interprets this as a strong rebuke, indicating that they did not cease sinning, for we do not find any other prophecy among them, even though if they were prophets, how could they have sinned with the spies, and all of them perished in the wilderness due to that sin? And if we interpret 'and they did not add' according to Rashi's explanation (Numbers 11:26), the question still remains: why did the Lord withhold prophecy from them? And He, may He be blessed, does not withhold good from His followers. Furthermore, what was the purpose of their prophecy, given that it was only for one day, and even then, they did not require it for the matter of meat, as there is no mention in the Scripture of any action or utterance they made regarding that matter.
Rashi
but I have found no rest Heb. ומנוחה. The Shechinah has not rested upon me to prophesy. Cf. “And the spirit rested (ותנח) upon them” (Num. 12:26). “Why am I different from the disciples of the prophets? Joshua served Moses and the Holy Spirit rested upon him. Elisha served Elijah and the Holy Spirit rested upon him. Why am I different?”
Kitzur Ba'al HaTurim
ותנח "and rested" is 2 times on Tanakh, "And the ark rested." "and the spirit rested upon them (Num 11:26)." To say that the Holy Spirit rested on those who remained in the ark and that is it "And the spirit rested on them."
Rashi
they rest on the dust Heb. נחת, will lodge, an expression of (Num. 11:26), “the spirit rested (ותנח) upon them.”