What is the ruling on the salary if an employee agrees with the manager to attend only when there is work?

Question:
He says: I work in one of the ministries, but I do not go to work because I have an agreement with my boss that if there is work, I come, and if there is no work, I do not attend. What is the ruling on the salary?

Answer:
You must attend work, whether there is work or not, during the working hours, unless you have an excuse. If you have a valid religious excuse, there is no harm. But without an excuse, you must attend even if there is no work, because what is required of you is to be dedicated to work during the working hours. Perhaps work will arise, or perhaps a need will arise.