וַיֹּצֵ֨א מֹשֶׁ֤ה אֶת־כָּל־הַמַּטֹּת֙ מִלִּפְנֵ֣י יְהוָ֔ה אֶֽל־כָּל־בְּנֵ֖י יִשְׂרָאֵ֑ל וַיִּרְא֥וּ וַיִּקְח֖וּ אִ֥ישׁ מַטֵּֽהוּ׃ (ס)
Sforno on Numbers
ויראו ויקחו איש מטהו. This was the reminder for all times, a miracle which silenced their complaints forthwith.
Rabbeinu Bahya
ויראו ויקח איש מטהו, “when they saw, each (tribal representative) took his own staff.” Each one knew which was his staff as they had inscribed their names on it.