It is true that signing a contract is an executive function...
It is true that signing a contract is an executive function but without the ratification of parliament, it will never become binding. So, it is not true that there is a redline separating the three powers from one another and one can not interfere in the others’ business, i.e. neither the government issue any executive order nor parliament interfere in executive affairs. Still, each of the three powers has its own special function.
However, the Islamic system is different from others with respect to the issue of legislation. In the laic systems, the basis and pivot of law is material collective interests of people and in addition to their ratification, the execution of laws is also based on those interests. In Islam, however, the material and worldly interests of people must be taken into account in legislation but not at the expense of neglecting their spiritual and otherworldly interests.
In fact, in the codification of laws spiritual interests take precedence over material interests. This is the essential and fundamental point that distinguishes the Islamic system from the materialistic, laic and secular systems. Naturally, in such a system, the burden of responsibility of the executive is heavier than that of other systems.
That is, apart from urging the people to observe social rights and not oppress each other and prevent chaos and disorder, the executive must also observe Islamic values and implement them. First principle of human conduct An important feature of man is the power of will and choice that makes him distinct from animals and angels. Animals are motivated by their instincts and there is no room for choice and selection in them.
The level of choice that sometimes exists in them stems from their instincts and they have no rational choice that emanates from intelligence and thinking. An animal which is trained to behave in a certain way and perform a certain action by the order of its trainer does so because there is a certain amount of choice within the limits of instinctive actions. Angels, however, have celestial and heavenly attributes and they have no inclination or desire to do evil and deviate from truth.
They are among the most holy and nearest ones to God and have exalted, pure and spotless stations, but they have no choice. In reality, their nature is based upon unconditional worship, obedience and submission to God.