What is the ruling on money acquired from an early retirement pension obtained by feigning illness to escape harm at work, and is this money considered permissible or forbidden?

If the pension is based on a false claim of illness, then it is impermissible to take it because it violates the contract, in accordance with Allah's saying: "O you who have believed, fulfill [all] contracts," and the Prophet's (peace be upon him) saying: "Muslims are bound by their conditions." As for the installment of the health insurance fund, it is permissible to benefit from it only to the extent of the contribution, along with the necessity of sincere repentance for what has passed.