Before they call — God promised, Isaiah 58:9, to answer them, when they called: here he promises to answer the words, as soon as they should be formed in their hearts before they could get them out of their lips. While — Yea, while they were speaking.
Related Commentaries of Isaiah 65:24
Isaiah 65:24
24 And it shall come to pass, that before they call, I will answer; and while they are yet speaking, I will hear.