On the authority of Abu Tha’laba Al-Khushani, peace and blessings of Allah be upon him, reported: The Messenger of Allah, peace and blessings be upon him, said:
Verily, Allah has made duties obligatory, so do not neglect them. He has set limits, so do not transgress them. He has made some things sacred, so do no violate them. He has remained silent concerning things as mercy for you, not out of forgetfulness, so do not search them out.
إِنَّ اللَّهَ فَرَضَ فَرَائِضَ فَلَا تُضَيِّعُوهَا وَحَدَّ حُدُودًا فَلَا تَعْتَدُوهَا وَسَكَتَ عَنْ أَشْيَاءَ رَحْمَةً لَكُمْ غَيْرَ نِسْيَانٍ فَلَا تَبْحَثُوا عَنْهَا
Source: Sunan Al-Daraqutani 4316