קִדְּמ֣וּ שָׁ֭רִים אַחַ֣ר נֹגְנִ֑ים בְּת֥וֹךְ עֲ֝לָמ֗וֹת תּוֹפֵפֽוֹת׃
歌唱的人走在前頭，奏樂的人跟在後面，擊鼓的少女們在他們中間。
Mesillat Yesharim
And in the Midrash (Vayikra Rabba 11:9) on the verse (Tehilim 48:15) "He shall lead us in youth" - [filled] with zeal as young maidens, as it is said: "in the midst of maidens playing the timbrels" (Tehilim 68:26) ["in youth" and "young maidens" are related words in Hebrew].
Mesillat Yesharim
The means through which Zeal is acquired are the same ones through which Watchfulness is acquired, and their levels are likewise similar as I wrote earlier.