Is money acquired by an employee through divulging information to a winning bidder, and then grown through investment by his wife, considered illicit money, and how can it be disposed of if it has commingled with other funds and its amount is no longer known?

It is not permissible for an employee in a bidding company to inform one of the applicants about the company's requirements, nor to take money for doing so. If he does, he has taken ill-gotten gains (suḥt), and he must repent and dispose of the money in charitable ways without returning it to those who paid it.

Similarly, whoever was given this money while knowing its true nature must dispose of it by spending it in charitable ways. As for his profit, it is his, in accordance with theḥadīth of the Prophet, peace and blessings be upon him: "Revenue follows liability."

However, if someone was given this money and did not know its true nature, there is no sin upon him for accepting it and disposing of it. The matter is based on the original presumption unless the nature of the money is known with certainty. It is obligatory for the one who took the forbidden money (the husband) or his wife if she knew its true nature, to disburse the original amount of the money in charitable ways.