And your Lord has decreed that you worship none but Him. And that you be dutiful to your parents. If one of them or both of them attain old age in your life, say not to them a word of disrespect, nor shout at them but address them in terms of honour. Al Qura'an.
Man is so strange. We forget ... And He is Allah (to be worshipped Alone) in the heavens and on the earth, He knows what you conceal and what you reveal, and He knows what you earn (good or bad). Qur'an al-An'am (The Cattle) 6:3