What is the ruling on a Egyptian consulting company operating in Saudi Arabia refusing to grant its Egyptian employees leave or allow them to travel to Egypt unless they sign a promissory note for one hundred thousand Egyptian pounds, given that this condition was not mentioned in the contract or communicated to them in advance, and with the pretext of guaranteeing their return?

Contracting parties are bound by what the contract necessitates, or what is explicitly stipulated or customarily understood within it, due to the Almighty's saying: "O you who have believed, fulfill [all] contracts," and the Hadith: "Muslims are bound by their conditions, except for a condition that makes a lawful thing unlawful, or an unlawful thing lawful." Therefore, neither contracting party has the right to obligate the other to something that is not necessitated by the contract, or was not stipulated therein. Accordingly, the employer does not have the right to obligate the employee to what has been mentioned.