What is the ruling on leaving work and not returning to it after taking leave during the three-month period agreed upon after submitting a resignation, due to the sick wife's (cancer patient) need for her husband to be with her, knowing that the employer is cooperative and may be harmed by the absence of a replacement?

If the employment contract includes a condition for a specific duration, it must be fulfilled. It is not permissible to travel and leave work before the expiry of this period except with the employer's permission, based on the Prophet's (peace and blessings be upon him) saying: "Muslims are bound by their conditions." It is recommended to explain the circumstances to the employer, as they might exempt you from the condition. If they do not agree, then you must fulfill it. It is also recommended to frequently pray for your wife's healing, seek times when prayers are answered, and perform legal ruqyah on her.