גִּילִ֨י מְאֹ֜ד בַּת־צִיּ֗וֹן הָרִ֙יעִי֙ בַּ֣ת יְרוּשָׁלִַ֔ם הִנֵּ֤ה מַלְכֵּךְ֙ יָ֣בוֹא לָ֔ךְ צַדִּ֥יק וְנוֹשָׁ֖ע ה֑וּא עָנִי֙ וְרֹכֵ֣ב עַל־חֲמ֔וֹר וְעַל־עַ֖יִר בֶּן־אֲתֹנֽוֹת׃
Freue dich sehr, Tochter Zion, schreie, Tochter Jerusalem! Siehe, dein König kommt zu dir. Er ist triumphierend und siegreich. Niedrig und reitet auf einem Esel, sogar auf einem Fohlen, dem Fohlen eines Esels.
Rashi on Zechariah
Behold! Your king shall come to you It is impossible to interpret this except as referring to the King Messiah, as it is stated: “and his rule shall be from sea to sea.” We do not find that Israel had such a ruler during the days of the Second Temple.
Rashi on Zechariah
and riding a donkey This is a symbol of humility.