Qur'an, Al-Isra, Surah 17:34b-38
Keep your promises; you are accountable for all you promise.
Do not follow advice which you do not understand. Make detailed inquiries with your eyes, ears and mind.
Do not strut about proudly. You cannot possess the earth, and you cannot rival the mountains in stature.
Avoid all evil; avoid all that is odious in the sight of the Lord.