Isaiah 65:24 Midrash: Devarim Rabbah, Eikhah Rabbah, Shir HaShirim Rabbah & Midrash Tanchuma

וְהָיָ֥ה טֶֽרֶם־יִקְרָ֖אוּ וַאֲנִ֣י אֶעֱנֶ֑ה ע֛וֹד הֵ֥ם מְדַבְּרִ֖ים וַאֲנִ֥י אֶשְׁמָֽע׃

And it shall come to pass that, before they call, I will answer, And while they are yet speaking, I will hear.