quran

‎"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(23)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."(24)"

(Quran : Surat Al-'Isrā' 24/25 )