פּירוש אויף ישעיהו 12:6

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

“Shout for joy” [12:6]. Rejoice, those who dwell in Zion, for the Holy One of Israel is great among you. That is to say, the Holy One who does great wonders and miracles with you.

We recite this haftorah on Passover because the haftorah speaks about how the Messiah will come and how the Holy One killed Sennacherib and his people on Passover. The Messiah will also come on Passover, to perform miracles for us. Amen.