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وَقَضَى رَبُّكَ أَلاَّ تَعْبُدُواْ إِلاَّ إِيَّاهُ وَبِالْوَالِدَيْنِ إِحْسَانًا إِمَّا يَبْلُغَنَّ عِندَكَ الْكِبَرَ أَحَدُهُمَا أَوْ كِلاَهُمَا فَلاَ تَقُل لَّهُمَآ أُفٍّ وَلاَ تَنْهَرْهُمَا وَقُل لَّهُمَا قَوْلاً كَرِيمًا . وَاخْفِضْ لَهُمَا جَنَاحَ الذُّلِّ مِنَ الرَّحْمَةِ وَقُل رَّبِّ ارْحَمْهُمَا كَمَا رَبَّيَانِي صَغِيرًا . رَّبُّكُمْ أَعْلَمُ بِمَا فِي نُفُوسِكُمْ إِن تَكُونُواْ صَالِحِينَ فَإِنَّهُ كَانَ لِلأَوَّابِينَ غَفُورًا  الإسراء/23-25

( 23 )   And your Lord has decreed that you not worship except Him, and to parents, good treatment. Whether one or both of them reach old age [while] with you, say not to them [so much as], “uff,” and do not repel them but speak to them a noble word.
( 24 )   And lower to them the wing of humility out of mercy and say, “My Lord, have mercy upon them as they brought me up [when I was] small.”
( 25 )   Your Lord is most knowing of what is within yourselves. If you should be righteous [in intention] – then indeed He is ever, to the often returning [to Him], Forgiving.