תּלמוד אויף ישעיהו 52:8

R’ Chiya bar Aba said in the name of R’ Yochanan: from where do we learn that the resurrection of the dead is taught by the Torah? As it says “The voice of your watchmen- they raised a voice, together they shall sing…” (Isaiah 52:8) It does not say ‘they sang’ but rather ‘they shall sing’ – from here we learn that the resurrection of the dead is taught in the Torah. And R’ Chiya bar Aba said in the name of R’ Yochanan: in the future all the prophets will sing a song with one voice, as it says “The voice of your watchmen- they raised a voice, together they shall sing…”