يَا أَيُّهَا الَّذِينَ آمَنُوا عَلَيْكُمْ أَنفُسَكُمْ ۖ لَا يَضُرُّكُم مَّن ضَلَّ إِذَا اهْتَدَيْتُمْ ۚ إِلَى اللَّهِ مَرْجِعُكُمْ جَمِيعًا فَيُنَبِّئُكُم بِمَا كُنتُمْ تَعْمَلُونَ

The ban on raising unnecessary questions in force at the time of the revelation of the Quran is applicable even today. The best and correct thing to do is to keep any order that is given in its original form. There should be no attempt, by raising unnecessary questions, to extend or reduce the limits of its restriction. Making a brief command more detailed, making an absolute command a limited one and making efforts to make an indefinite order definite, are additions in religion which God and the Prophet have prohibited. The former elders of a community attain holy status after a certain passage of time. Many kinds of wrong practices occur in the name of these long deceased people. So much so that if they had established the custom of venerating sheeps and camels, their successors would go on doing so without giving any thought to it. Such misguided behaviour, which is based on a tradition of holiness, is so firmly and deeply rooted that it is very difficult to dissuade people from it. It is possible to rise above such psychological complications only when a man acquires a firm belief, in the real sense, that finally he has to appear before God. One holding such a belief man accepts today itself what he will be compelled to accept after death; but acceptance at that time will be of no use to anyone.

— Source: Tazkirul Quran (Maulana Wahiduddin Khan) via Quran.com (5:105)