“Your Allah has decreed that you worship none save Allah, and (that you should) be kind to your parents.” (17:23)
Hazrat Abdullah Ibn Masud narrates: ” I asked the Prophet of Allah (SAW) as to which act Allah likes the best. The Holy Prophet (SAW) said, “The prayers offered in time.” I asked, “What is it that Allah likes next best. “The Holy Prophet (SAW) said, “Good treatmentof your mother and father”. When I asked him (SAW) about the third most excellent act, he (SAW) said, ‘ Fighing in the way of Allah.” (Bukhari, Muslim)
Hazrat Abdullah further says: “A man once presented himself before the Holy Prophet (SAW) and said, “I affirm solemnly before you for Hijrat and Jihad and wish for recompense from Allah. “The Holy Prophet (SAW) thereupon enquired: “Is anyone of your parents alive?” He said, “Yes, O Prophet of Allah, and by grace of Allah both are living.” The Holy Prophet (SAW) then asked, “Do you really wish for recompense from Allah for your Hijrat and Jihad?” When he said he did want it, the Holy Prophet (SAW) commanded:
“Go and stay with your parents and serve them well.” (Muslim)
Hazrat Abu Umamah says that once a person asked the Holy Prophet (SAW) about the rights of the parents upon their children. The Holy Prophet (SAW) said, “Your parents are your Paradise and they are your Hell.” (Ibn-Majah)
That is by doing good to them you will earn Paradise and if you ignore their rights you will go to Hell.