Kindness to Parents

قَالَ الصَّادِقُ )ع): بِرُّ الْوَالِدَيْنِ مِنْ حُسْنِ مَعْرِفَةِ الْعَبْدِ بِاللٌّهِ إِذْ لاَ عِبَادَةَ أَسْرَعُ بُلُوغاً بِصَاحِبِهَا إِلَى رِضَى اللٌّهِ مِنْ بِرِّ الْوَالِدَيْنِ

Imam Sadiq (A.S) has said: “Goodness towards the parents is an indication of a person’s excellent cognizance of Allah. This is because there is no worship that can take a person towards the happiness of Allah faster than exhibiting respect towards his Muslim parents for the sake of Allah.”‌

Biharul Anwar, Volume 74, pg.77

Other links:

The Greatest Obligatory Act