Is there money that is detestable (makrooh), and how should one deal with it, and is it permissible?

Wealth is divided into clear lawful (halal) and clear unlawful (haram). There is also wealth that falls between them, known as "doubtful matters" (shubuhat) or "disliked" (makruh), either due to an unknown source, an obscure nature, conflicting evidence, or scholarly disagreement regarding it. The ruling on these doubtful matters has varied, with some stating prohibition and others disliking it. The essence of what scholars have explained regarding shubuhat boils down to four points: conflicting evidence, scholarly disagreement, what attracts both the act and its omission, and that the disliked is a barrier between a person and the unlawful.

Examples of disliked wealth include: dealing with someone whose wealth is mostly unlawful but its exact source is unknown, accepting gifts from a ruler if the majority of their wealth is unlawful, the earnings of a cupper (hajjām), and any wealth acquired through a means that is disliked to earn from. It is preferable not to benefit from disliked wealth, but it is not prohibited.