Musnad Abu Ya'la al-Mawsili 42:27

A man came to the Prophet, may Allah bless him and grant him peace, and said: "O Messenger of Allah, advise me." He said: "You must have Taqwa (fear/consciousness) of Allah, for it is the gathering of all good. You must engage in Jihad, for it is the monasticism of the Muslims. You must remember Allah and recite His Book, for it is a light for you on the earth and a mention of you in the heaven. And restrain your tongue except for good, for by that you will overcome the Shaytan."