John Gill Commentary Exodus 15:21

"And Miriam answered them, Sing ye to Jehovah, for he hath triumphed gloriously; The horse and his rider hath he thrown into the sea." — Exodus 15:21 (ASV)

And Miriam answered them
The men, for the word is masculine; that is, repeated, and sung the same song word for word after them, as they had done, of which a specimen is given by reciting the first clause of the song: sing you to the Lord ;
which is by way of exhortation to the women to sing with her, as Moses begins the song thus: "I will sing unto the Lord", for he has triumphed gloriously; the horse and his rider has he
thrown into the sea; (See Gill on Exodus 15:1), the manner of their singing, according to the Jews ^F26 , was, Moses first said, "I will sing", and they said it after him.

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FOOTNOTES:

• F26: T. Hieros. Sotah, fol. 20. 3. T. Bab. Sotah, fol. 30. 2.