Musnad Ahmad 31:247

And the Messenger of Allah, may Allah bless him and grant him peace, said: "Indeed, the Shaytan said: 'By Your might, O Lord, I will not cease to lead Your servants astray as long as their souls are in their bodies.' The Lord said: 'By My might and My majesty, I will not cease to forgive them as long as they seek My forgiveness.'"