Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:78:1 – In the name of Allah, the Entirely Merciful, the Especially Merciful.

About what are they asking one another?  

About what, about what thing, are they, the people of Quraysh, questioning one another?
القرآن:٧٨:١ – بِسْمِ اللَّهِ الرَّحْمَٰنِ الرَّحِيمِ

عَمَّ يَتَسَاءَلُونَ  

{عمَّ} عن أي شيء {يتساءلون} يسال بعض قريش بعضا.