Is it permissible to join the army without the parents' consent, knowing that the son desires it and has toiled in his studies to achieve this dream?

Faith and hatred of Islam cannot coexist in one heart. And whoever hates anything that Allah has revealed, his deeds will be nullified. The scholars have considered hatred of anything brought by the Messenger of Allah, peace and blessings be upon him, to be among the nullifiers of Islam.

Among the virtues of Sharia is its consideration for the rights of parents and the obligation to honor them and treat them with kindness. This is a reward for their great efforts with their child. Nevertheless, Sharia has not imposed absolute obedience to them. Rather, it has considered the child's perspective, needs, and circumstances. Thus, their command must have a valid purpose and not cause harm to the child, although hardship can be tolerated.

A person is obliged to obey their parents in matters that do not involve disobedience (to Allah), even if they are disobedient (to Allah). This applies to matters that benefit them and do not harm the child. If it is difficult for the child but does not harm him, it is obligatory; otherwise, it is not.

The considered fear for the child is among the valid needs and purposes that necessitate obedience to them. If they forbid him from something out of fear for his death, loss, or the damage of a limb, he must obey them, for parents have the right to compassion and tenderness towards their child.

Among the forms of forbidden disobedience (to parents) are: disobeying a command or prohibition in matters where there is fear for the child's life or a limb, outside of obligatory Jihad; or disobeying them in a journey that causes them hardship and is not obligatory for him; or a long absence that is not for seeking beneficial knowledge or earning a livelihood.