In the Qur’an there are forty duas which were revealed that begin with the Arabic word Rabbana (رَبَّنَا) meaning, ‘Our Lord’.
The verse then continues by asking Allah (swt) of something, forgiveness, wealth, success, prosperity, protection, safety, victory etc,.
Collectively these are known as the 40 Rabbana duas of the Qur’an and have some of the best Quranic duas a person can learn, memorize, and recite.