Musnad Ahmad 298:10

'Abd al-Razzaq narrated to us, he said: Ma'mar narrated to us, from Ayyub, from Abu Qilabah, from Hisham ibn 'Amir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, the hair at the back of the Dajjal's head is curly, curly. So whoever says, 'You are my Lord,' has been tempted. And whoever says, 'You have lied; my Lord is Allah, upon Him I have relied,' then it will not harm him—or he said: 'Then there is no temptation upon him.'"