וְהָיָ֨ה לְא֥וֹת וּלְעֵ֛ד לַֽיהוָ֥ה צְבָא֖וֹת בְּאֶ֣רֶץ מִצְרָ֑יִם כִּֽי־יִצְעֲק֤וּ אֶל־יְהוָה֙ מִפְּנֵ֣י לֹֽחֲצִ֔ים וְיִשְׁלַ֥ח לָהֶ֛ם מוֹשִׁ֥יעַ וָרָ֖ב וְהִצִּילָֽם׃
And it shall be for a sign and for a witness unto the LORD of hosts in the land of Egypt; for they shall cry unto the LORD because of the oppressors, and He will send them a saviour, and a defender, who will deliver them.
Rashi on Isaiah
And it shall be The altar shall be for a sign and for a witness between them and the Omnipresent.
Ibn Ezra on Isaiah
They shall cry unto the Lord because of the oppressors, etc. Whosoever will be in trouble will come thither to bring his offering.
Rashi on Isaiah
a savior and a prince Heb. מוֹשִׁיעַ וְרָב, a savior and a prince.