Hadithcore
Riyad as-Salihin, 1816

Al-Mughirah bin Shu'bah (May Allah be pleased with him) said:

No one asked the Messenger of Allah (ﷺ) more about Dajjal than I asked him. He said to me, "He will not harm you." I said: "O Messenger of Allah, it is reported that he will have with him a mountain of bread and a river full of water." Thereupon he said, "He (Dajjal) is far too worthless and insignificant near Allah (to let him deceive the believers)." <b>[Al-Bukhari and Muslim]</b>.

وعن المغيرة بن شعبة رضي الله عنه قال‏:‏ ما سأل أحد رسول الله صلى الله عليه وسلم عن الدجال أكثر مما سألته؛ وإنه قال لي‏:‏ ‏"‏مايضرك‏؟‏ ‏"‏قلت‏:‏ إنهم يقولون‏:‏ إن معه جبل خبز ونهر ماء‏!‏ قال‏:‏ ‏"‏هو أهون على الله من ذلك‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 18, Hadith 9
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) One should learn about evil so as to avoid it.<br> 2) Trials and hardships only increase the believers in steadfastness and certitude.