Musannaf Ibn Abi Shayba 33:955

Al-Thaqafi narrated to us, from Ayyub, from Abu Qilabah, who said: When Allah cursed Iblis, he asked Him for respite, so He granted him respite until the Day of Judgment. He (Iblis) said: "By Your Might, I will not depart from the interior or the heart of the son of Adam as long as the soul is within him." He (Allah) said: "By My Might, I will not withhold repentance from him as long as the soul is within him."