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bukhari:5002 – ʿUmar b. Ḥafṣ from my father > al-Aʿmash > Muslim > Masrūq > ʿAbdullāh ؓ

By Allah other than Whom none has the right to be worshipped! There is no Sura revealed in Allah's Book but I know at what place it was revealed; and there is no Verse revealed in Allah's Book but I know about whom it was revealed. And if I know that there is somebody who knows Allah's Book better than I, and he is at a place that camels can reach, I would go to him.  

البخاري:٥٠٠٢ – حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ حَدَّثَنَا أَبِي حَدَّثَنَا الأَعْمَشُ حَدَّثَنَا مُسْلِمٌ عَنْ مَسْرُوقٍ قَالَ قَالَ عَبْدُ اللَّهِ ؓ

وَاللَّهِ الَّذِي لاَ إِلَهَ غَيْرُهُ مَا أُنْزِلَتْ سُورَةٌ مِنْ كِتَابِ اللَّهِ إِلاَّ أَنَا أَعْلَمُ أَيْنَ أُنْزِلَتْ وَلاَ أُنْزِلَتْ آيَةٌ مِنْ كِتَابِ اللَّهِ إِلاَّ أَنَا أَعْلَمُ فِيمَ أُنْزِلَتْ وَلَوْ أَعْلَمُ أَحَدًا أَعْلَمَ مِنِّي بِكِتَابِ اللَّهِ تُبَلِّغُهُ الإِبِلُ لَرَكِبْتُ إِلَيْهِ  

See similar narrations below:

Collected by Muslim, Ṭabarānī
muslim:2463 – Abū Kurayb > Yaḥyá b. Ādam > Quṭbah > al-Aʿmash > Muslim > Masrūq > ʿAbdullāh

By Him besides Whom there is no god, there is no chapter in the Book of Allah about which I do not know as to where it was revealed and there is no verse about which I do not know in what context it was revealed, and if I were to know of one having a better understanding of the Book of Allah than I (and I could reach him) on the back of the mule, I would have definitely gone to him on camel's back.  

مسلم:٢٤٦٣ – حَدَّثَنَا أَبُو كُرَيْبٍ حَدَّثَنَا يَحْيَى بْنُ آدَمَ حَدَّثَنَا قُطْبَةُ عَنِ الأَعْمَشِ عَنْ مُسْلِمٍ عَنْ مَسْرُوقٍ عَنْ عَبْدِ اللَّهِ قَالَ

وَالَّذِي لاَ إِلَهَ غَيْرُهُ مَا مِنْ كِتَابِ اللَّهِ سُورَةٌ إِلاَّ أَنَا أَعْلَمُ حَيْثُ نَزَلَتْ وَمَا مِنْ آيَةٍ إِلاَّ أَنَا أَعْلَمُ فِيمَا أُنْزِلَتْ وَلَوْ أَعْلَمُ أَحَدًا هُوَ أَعْلَمُ بِكِتَابِ اللَّهِ مِنِّي تَبْلُغُهُ الإِبِلُ لَرَكِبْتُ إِلَيْهِ  

tabarani:8429 – Muḥammad b. al-Naḍr al-Azdī > Muʿāwiyah b. ʿAmr > Zāʾidah > al-Aʿmash > Muslim > Masrūq > ʿAbdullāh > And al-Lh Mā Nazalat from al-Qurān Sūrah Illā > Aʿlam Ḥayth Unzilat Walā Unzilat Minh Āyah Illā

[Machine] "And by Allah, no verse from the Quran was revealed except that I know where it was revealed, and no verse is revealed except that I know its context. And if I knew anyone who knows more about the Book of Allah than me, even if it were a distance of a camel's journey, I would go to him."  

الطبراني:٨٤٢٩ – حَدَّثَنَا مُحَمَّدُ بْنُ النَّضْرِ الْأَزْدِيُّ ثنا مُعَاوِيَةُ بْنُ عَمْرٍو ثنا زَائِدَةُ عَنِ الْأَعْمَشِ عَنْ مُسْلِمٍ عَنْ مَسْرُوقٍ عَنْ عَبْدِ اللهِ ؓ قَالَ

«وَاللهِ مَا نَزَلَتْ مِنَ الْقُرْآنِ سُورَةٌ إِلَّا أَنَا أَعْلَمُ حَيْثُ أُنْزِلَتْ وَلَا أُنْزِلَتْ مِنْهُ آيَةٌ إِلَّا أَنَا أَعْلَمُ فِيمَا أُنْزِلَتْ وَلَوْ أَعْلَمُ أَحَدًا أَعْلَمُ بِكِتَابِ اللهِ مِنِّي تَبْلُغُهُ الْإِبِلُ لَأَتَيْتُهُ»  

tabarani:8430 – ʿAbdullāh b. Muḥammad b. al-ʿAbbās al-Aṣbahānī > Sahl b. ʿUthmān > ʿAthhām b. ʿAlī > al-Aʿmash > Muslim > Masrūq > ʿAbdullāh

By Him besides Whom there is no god, there is no chapter in the Book of Allah about which I do not know as to where it was revealed and there is no verse about which I do not know in what context it was revealed, and if I were to know of one having a better understanding of the Book of Allah than I (and I could reach him) on the back of the mule, I would have definitely gone to him on camel's back. (Using translation from Muslim 2463)   

الطبراني:٨٤٣٠ – حَدَّثَنَا عَبْدُ اللهِ بْنُ مُحَمَّدِ بْنِ الْعَبَّاسِ الْأَصْبَهَانِيُّ ثنا سَهْلُ بْنُ عُثْمَانَ ثنا عَثَّامُ بْنُ عَلِيٍّ عَنِ الْأَعْمَشِ عَنْ مُسْلِمٍ عَنْ مَسْرُوقٍ عَنْ عَبْدِ اللهِ قَالَ

«وَالَّذِي لَا إِلَهَ غَيْرُهُ مَا نَزَلَتْ سُورَةٌ مِنَ الْقُرْآنِ إِلَّا وَأَنَا أَعْلَمُ حَيْثُ أُنْزِلَتْ وَلَا آيَةٌ وَأَعْلَمُ فِيمَنْ نَزَلَتْ وَلَوْ أَعْلَمُ أَحَدًا أَعْلَمُ بِكِتَابِ اللهِ مِنِّي تَبْلُغُهُ الْإِبِلُ لَرَكِبْتُ إِلَيْهِ»  

tabarani:8431 – Muḥammad b. ʿUthmān b. Abū Shaybah > Ismāʿīl b. Bahrām > Suʿayr b. al-Khims > al-Mughīrah > Abū al-Ḍuḥá > Masrūq > ʿAbdullāh

By Him besides Whom there is no god, there is no chapter in the Book of Allah about which I do not know as to where it was revealed and there is no verse about which I do not know in what context it was revealed, and if I were to know of one having a better understanding of the Book of Allah than I (and I could reach him) on the back of the mule, I would have definitely gone to him on camel's back. (Using translation from Muslim 2463)   

الطبراني:٨٤٣١ – حَدَّثَنَا مُحَمَّدُ بْنُ عُثْمَانَ بْنِ أَبِي شَيْبَةَ ثنا إِسْمَاعِيلُ بْنُ بَهْرَامَ ثنا سُعَيْرُ بْنُ الْخِمْسِ عَنِ الْمُغِيرَةِ عَنْ أَبِي الضُّحَى عَنْ مَسْرُوقٍ عَنْ عَبْدِ اللهِ قَالَ

«مَا مِنْ كِتَابِ اللهِ آيَةٌ إِلَّا أَعْلَمُ حَيْثُ نَزَلَتْ وفِيمَنْ أُنْزِلَتْ وَلَوْ أَعْلَمُ أَحَدًا أَعْلَمُ بِكِتَابِ اللهِ مِنِّي تَبْلُغُهُ الْإِبِلُ لَرَحَلْتُ إِلَيْهِ»