Muslims of Switzerland should exhaust all the legal steps open to them to protect themselves against such repressive measures. I am sure they will prevail with the help of Allah.
In the meantime, if they are forced to do so, they can send them as long as they are in their pre-puberty stage while wearing proper, modest attire. I understand that the law is binding only on those who have not reached puberty.
In Islam, the strict rules of hijab apply only to women who have reached puberty. The Prophet’s wife `A’ishah tells us: When her sister Asma’ appeared before the Prophet (peace be upon him) wearing less than modest attire, he advised her: “Asma’, once a woman attains puberty, she should not expose any part of her body (before strangers) except face and hands.” So, since these girls are below the age of puberty, they may go to swimming in a mixed milieu as long as they do not have any fear of molestation.
If they have a choice of skipping the class for the day they should do so.
In conclusion, let the Muslim scholars and leaders decide the appropriate steps to take to counter such laws which are at once discriminatory and unjust.
Almighty Allah knows best.
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