Musnad Ahmad 538:0

Abu Tha'labah al-Khushani reported: The Messenger of Allah (ﷺ) said: "Verily, Allah the Exalted has laid down obligations, so do not neglect them; and He has set limits, so do not transgress them; and He has forbidden things, so do not violate them; and He has remained silent about things—out of mercy for you, not out of forgetfulness—so do not inquire about them."