Sayyidah Umm Salamah (may Allah be pleased with her) said: One night I thought about al-Masih al-Dajjal and sleep would not come to me. When morning came, I went early to the Messenger of Allah (peace and blessings be upon him) and told him about it. He (peace and blessings be upon him) said: "Do not do that, for if he emerges while I am present, Allah will suffice you through me, and if he emerges after I die, Allah will suffice you through the righteous." Then he (peace and blessings be upon him) stood up and mentioned the Dajjal, and said: "There is no prophet who did not warn his nation about him, and I warn you about him. He is one-eyed, and Allah Almighty is not one-eyed. Beware! The eye of al-Masih al-Dajjal is like a protruding grape."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19873