Sayyiduna Hisham bin Amir (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "Behind the head of the Dajjal there will be curls (waves) of hair. He will say: 'I am your Lord.' Whoever says: 'You are my Lord,' will fall into trial. And whoever says: 'You are a liar; my Lord is Allah, in Him I have put my trust and to Him I turn,' will not be harmed by him," or he said: "there will be no trial upon him."
Hadith Referenceالمعجم الكبير للطبراني / باب الهاء / 18676