your lord has ordained that you must not worship anything other than him and that you must be kind to your parents. if either or both of your parents should become advanced in age do not express to them words which show your slightest disappointment. never yell at them but always speak to them with kindness.
وقضى ربك ألا تعبدوا إلا إياه وبالوالدين إحسانا إما يبلغن عندك الكبر أحدهما أو كلاهما فلا تقل لهما أف ولا تنهرهما وقل لهما قولا كريما