Ibn Ezra on Isaiah

And thou shalt say. The second person refers to the Israelites, who returned home. כי Though. Comp. כי חטאתי לך רפאה נפשי Heal my soul, although I have sinned against thee (Ps. 41:5)

הנה אל ישועתי The God of my salvation is with me, and therefore אבטח I will dwell in safety. The explanation of יה, the half of the name of God, will be found in the Book of Psalms, and of זמרת in the Pentateuch (Exod. 15:2)

And you will draw water. By this figure the prophet indicates that they will rejoice exceedingly, as the thirsty rejoices when he draws water.

And you shall say one to the other. קראו Call aloud. עלילותיו His deeds.

זמרו Sing. Comp. זמרת the best fruit (Gen. 43:11). Lit. Give the best and choicest thing. מודעת Known. Participle Hophal. גאות Excellent thing. Feminine, as seen by the affix .ת

Cry out, etc. It is right, that thou, O Zion, shouldst lift up thy voice, for God is in thy midst.