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:37:12 –

But you wonder, while they mock,  

Nay, but (bal is for effecting a transition from one object to another, which in this case is to inform of his state and theirs) you marvel, (‘ajibta) addressing the Prophet (s), that is, ˹you marvel˺ that they deny you, while they engage in ridicule, at your marvelling,
القرآن:٣٧:١٢ –

بَلْ عَجِبْتَ وَيَسْخَرُونَ  

{بل} للانتقال من غرض إلى آخر وهو الإخبار بحاله وحالهم {عجبتَ} بفتح التاء خطابا للنبي ﷺ ، أي من تكذيبهم إياك {و} هم {يسخرون} من تعجبك.

See similar narrations below:

Collected by Ṭabarānī
tabarani:8689 – ʿAbdullāh b. Muḥammad b. Saʿīd b. Abū Maryam > al-Firyābī > Sufyān > al-Aʿmash > Ibrāhīm > ʿAbdullāh

[Machine] "That he has read it {Indeed, I was amazed and they mock}"  

الطبراني:٨٦٨٩ – حَدَّثَنَا عَبْدُ اللهِ بْنُ مُحَمَّدِ بْنِ سَعِيدِ بْنِ أَبِي مَرْيَمَ ثنا الْفِرْيَابِيُّ عَنْ سُفْيَانَ عَنِ الْأَعْمَشِ عَنْ إِبْرَاهِيمَ عَنْ عَبْدِ اللهِ

أَنَّهُ قَرَأَهَا {بَلْ عَجِبْتُ وَيَسْخَرُونَ}