Meditate upon these things; give thyself wholly to them, that thy profiting may appear to all. Take heed unto thyself and unto the doctrine; continue in them; for in doing this thou shalt both save thyself and them that hear thee.
1 Timothy 4:15-16
The messengers We sent before you (O Muhammad), were not other than men to whom We gave revelation. Ask the people of the Rememberence if you do not know. (We sent them) with clear signs and writings; and We have revealed to you (O Muhammad) the Rememberance (the Qur'an) that you may explain to mankind what was sent to them, that they may give thought.