Must the borrower repay the full amount of the loan from the employer (6000 dirhams), or is he entitled to deduct the salary for the vacation month and the end-of-service gratuity due to him after two years and eight months of work?

A lease is a binding contract, and neither party has the right to terminate it without the consent of the other. If the tenant terminates the contract without the landlord's consent, they are obligated to pay the full rent for the agreed-upon period. If an employee (the ajeer) refuses to complete the work despite being able to, they are not entitled to any part of the wage.

Therefore, if the contract period is still active, it is not permissible for you to leave the work if you are capable of doing it. If you do leave, you are not entitled to any part of your salary unless the office owner agrees.

However, if your leaving the work is after the contract period has ended, then you are entitled to everything that was agreed upon, based on the hadith: "Muslims are bound by their conditions." If the office owner refuses to pay, it is permissible for you to take from his debt that is with him and return any excess.