What is the ruling on working in banks, especially in the loans marketing department, with mention of the views of the four madhhabs and their evidence?

The ruling on working as a loan marketer depends on the type of loans. If the loans involve usury (riba), it is impermissible to work in their marketing, due to the Prophet (peace and blessings be upon him) saying: "Allah's Messenger cursed the one who consumes usury, the one who feeds it, its two witnesses, and its scribe, and he said: 'They are all equal (in sin).'" And due to Allah's saying: "And do not cooperate in sin and aggression."