7. Do you know why Allah Subhanahuthala revealed “Rabbana Athina” dua?

السلام عليكم ورحمة الله وبركاتة 

بِسْمِ ٱللَّٰهِ ٱلرَّحْمَٰنِٱلرَّحِيمِ

The Arabs of the Jahiliyyah after finishing rituals of Hajj hold gatherings to recite poetry to praise the deeds of their forefathers and waste the precious time of those blessed days. So Allahuthala asked those who performed Hajj to remember Allah more.

"So when you have accomplished your Manasik [Tawaf of the Ka’bah and As-Safa and Al-Marwah, stay at ‘Arafat, Muzdalifah and Mina, stoning of the specified pillars in Mina, slaughtering of animal], “Remember Allah as you remember your forefathers or with a far more remembrance."

But of mankind there are some who say: “Our Lord! Give us (Your Bounties) in this world!” and for such there will be no portion in the Hereafter. [2:200]

And there are some among them who say: “Our Lord! Grant us good in this world and good in the hereafter, and save us from the torment of the fire. [2:201]. For them there will be allotted a share for what they have earned. And Allah is Swift at reckoning. [2:202]

الحمدلله