The القرآنic دعاء for parents is: 'Rabbi irhamhuma kama rabbayani saghira' — My Lord, have mercy upon them as they brought me up when I was small (القرآن 17:24). هذا الدعاء is مستحب to be recited regularly, especially during الحج and العمرة when الأدعية are readily accepted.
رَبِّ ارْحَمْهُمَا كَمَا رَبَّيَانِي صَغِيرًا
Rabbir-hamhuma kama rabbayani saghira.
Meaning: My Lord, have mercy upon them both, as they brought me up when I was small.
Source: Sahih Muslim #1631هذا الدعاء is directly from القرآن (Surah Al-Isra, 17:24), making it among the most powerful الأدعية for parents. Allah commands kindness to parents second only to His own worship. النبي said the pleasure of Allah is in the pleasure of the parents, and His anger is in their anger (سنن الترمذي 1899).
رَبِّ ارْحَمْهُمَا كَمَا رَبَّيَانِي صَغِيرًا
The Prophet (peace be upon him) said: 'When a person dies, his deeds come to an end except for three: ongoing charity, beneficial knowledge, or a righteous child who prays for him.' This verse from Surah Al-Isra (17:24) is the dua Allah commands for parents.