"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 reach old age in your life, never say 'uff' (an expression of displeasure) , nor shout at them but address them in terms of honour. And humble yourself to them out of mercy and say, 'My Lord! Bestow on them Your Mercy as they did bring me up when I was small.'" [Quran, 17:23,24]