When people say ‘good luck’ and the like, as a kind of supplication for the person to whom it is said, and wishing him well, there is nothing wrong with that, as is obvious. In fact, it is praiseworthy because it is a kind of supplication for good and wishing the Muslims well. But one should not wish or pray for bad luck for a Muslim, because this involves transgression and enmity towards one’s brother in faith.

Prophet Muhammad commanded us to close the doors at night and mention the name of Allah whilst closing them, when night begins, when going to sleep. That is so that the Muslim may protect his house and his family from any harmful devil coming in, whether from among mankind or the jinn, and also from harmful animals or insects coming in.

It is not appropriate for the Muslim to enter the bathroom except for the purpose of relieving himself, and when he enters the bathroom he should refrain from eating and drinking until he comes out.

The rights that one Muslim has over another are man; some of which are individual obligations that are required of each person, and if he fails to do them he is sinning. Others rights are communal obligations; if some people do them, the burden of sin is waived for the rest. And some are encouraged but not obligatory, so the Muslim is not sinning if he does not do them.