With him is an arm of flesh,.... Only weak, frail, mortal men, not at all to be feared; nothing in comparison of the Lord:
but with us is the Lord our God, to help us, and to fight our battles; who is the Lord God Almighty, who has the host of heaven at his command, and with whom all the inhabitants of the earth are as nothing; the Targum is,
"the Word of the Lord our God is for us to help us, and fight our battles:''
and the people rested themselves upon the words of Hezekiah king of Judah; not upon his bare words, but on what was contained in them, on the strength and power of the Lord God he assured them was on their side; they believed what he said to be true, and trusted in the Lord that he would save them.