Your Lord has decreed that you worship none but Him, and do good to parents. 

If any one of them or both of them reach old age, do not say to them: uff (a word or expression of anger or contempt)

 and do not scold them, and address them with respectful words,

and submit yourself before them in humility out of compassion, 

and say, “My Lord, be merciful to them as they have brought me up in my childhood”.