Sahih al-Bukhari, Hadith 3392 ⓘ
Narrated `Aisha: The Prophet returned to Khadija while his heart was beating rapidly. She took him to Waraqa bin Naufal who was a Christian convert and used to read the Gospels in Arabic Waraqa asked (the Prophet), "What do you see?" When he told him, Waraqa said, "That is the same angel whom Allah sent to the Prophet) Moses. Should I live till you receive the Divine Message, I will support you strongly."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، حَدَّثَنَا اللَّيْثُ، قَالَ حَدَّثَنِي عُقَيْلٌ، عَنِ ابْنِ شِهَابٍ، سَمِعْتُ عُرْوَةَ، قَالَ قَالَتْ عَائِشَةُ ـ رضى الله عنها فَرَجَعَ النَّبِيُّ صلى الله عليه وسلم إِلَى خَدِيجَةَ يَرْجُفُ فُؤَادُهُ، فَانْطَلَقَتْ بِهِ إِلَى وَرَقَةَ بْنِ نَوْفَلٍ، وَكَانَ رَجُلاً تَنَصَّرَ يَقْرَأُ الإِنْجِيلَ بِالْعَرَبِيَّةِ. فَقَالَ وَرَقَةُ مَاذَا تَرَى فَأَخْبَرَهُ. فَقَالَ وَرَقَةُ هَذَا النَّامُوسُ الَّذِي أَنْزَلَ اللَّهُ عَلَى مُوسَى، وَإِنْ أَدْرَكَنِي يَوْمُكَ أَنْصُرْكَ نَصْرًا مُؤَزَّرًا. النَّامُوسُ صَاحِبُ السِّرِّ الَّذِي يُطْلِعُهُ بِمَا يَسْتُرُهُ عَنْ غَيْرِهِ.
also referenced under: Book 60, Hadith 66 (In-Book) & Volume 4, Book 55, Hadith 605 (USC-MSA)