What should one do if he is unsure as to the ruling on a particular issue?
“If the onlooker or the one who has taken the path to Allah is confused in regards to the ruling on a particular issue – is it halal, or is it haram? – he should look to the harm that this action would bring about, its results, as well as its objectives. So, if it leads to clear harm, there is no way that the Legislator would enjoin it or allow it. In fact, the knowledge of its prohibition in His Shari’ah is clear cut, let alone if it were to constitute a path to the Anger of Allah and His Messenger.”
[‘Madarij as-Salikin’; 1/472]