Riyad us Saliheen: Hadith 1831

The Messenger of Allah (ﷺ) said, "Allah, the Exalted, has laid down certain duties which you should not neglect, and has put certain limits which you should not transgress, and has kept silent about other matters out of mercy for you and not out of forgetfulness, so do not seek to investigate them."

[Ad-Daraqutni and others]