Imam Ibn Bhattah al ‘Abkari (رحمه الله) stated:
The Messenger of Allah (صلى الله عليه و سلم) said: If you hear of the Dajjal, then avoid him to the best of your ability. Indeed a man will approach him (the Dajjal), and this man deems himself to be a believer. The Dajjal will continue to affect him until he eventually follows him due to what he witnesses of doubts.
Imam Ibn Bhattah commented:
This is the statement of the Messenger of Allah (صلى الله عليه و سلم), and indeed he is the truthful person, and one to be trusted. So fear Allah of Muslims! Do not let anyone allow his good thoughts of himself, and that which he feels he knows of his correct methodology, don’t allow this to make him bring about danger to his religion, by sitting with some people of desires. This person says: I will debate with them, or I will expose his (false) ideology.
Indeed, their fitna is greater than that of the Dajjal, their speech is stickier than the scab, and its burning of the hearts is more intense than the burning of firewood. We have seen individuals who used to curse them (the people of desires and innovation), and belittle them, but then then sat with them to refute and respond to them. These innovators continued to be simple with them, and hide their deceptive plots and obscure disbelief until those people who intended to refute them began to follow them!
I was informed by Al Mutawthee…… on the authority of Mughira, who said: Muhammad bin Sa’eeb – and he was not a person of desire – said to us: Come with us so that we can listen to them (the innovators and respond to them). He (Muhammad bin Sa’eeb) did not return until he had adapted their ideologies and his heart became attached to them!
Source: Al Ibaanah al Khubra by Imam Ibn Bhattah 2/470
Chapter: The Warning Against Befriending Individuals Who Sicken the Hearts and Destroy Emaan