Everything previously mentioned is Revelation and Wisdom

Allah says: `What We have commanded you to do is part of good manners, and what We have forbidden you are evil qualities. We have revealed this to you, O Muhammad, so that you may command the people likewise.'

وَلاَ تَجْعَلْ مَعَ اللَّهِ إِلَـهًا ءَاخَرَ فَتُلْقَى فِى جَهَنَّمَ مَلُومًا

After having described details of the injunctions appearing above, it was said in the last verse: كُلُّ ذَٰلِكَ كَانَ سَيِّئُهُ عِندَ رَ‌بِّكَ مَكْرُ‌وهًا (That which is evil, of all these, is detestable in the sight of your Lord - 38).

As for what has been forbidden in the said injunctions, their repugnance is obvious. But, within these there are some commandments where rights of parents and relatives have been enjoined or fulfillment of promises has been made mandatory. Here too, the purpose is to avoid doing the opposite of it, like hurting parents, breaking off from relatives and going back on solemn promises. Since all these things are haram or reprehensible, therefore, it has been called 'makruh' in a general sense of 'detestable' which includes the haram and makruh both. (Bayan al-Qur an)