Sahih al-Bukhari 4464

Arabic

حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا شَيْبَانُ، عَنْ يَحْيَى، عَنْ أَبِي سَلَمَةَ، عَنْ عَائِشَةَ، وَابْنِ، عَبَّاسٍ رضى الله عنهم أَنَّ النَّبِيَّ صلى الله عليه وسلم لَبِثَ بِمَكَّةَ عَشْرَ سِنِينَ يُنْزَلُ عَلَيْهِ الْقُرْآنُ، وَبِالْمَدِينَةِ عَشْرًا‏.‏

English translation

Narrated Aisha and Ibn `Abbas:The Prophet (ﷺ) stayed for ten years in Mecca with the Qur'an being revealed to him and he stayed in Medina for ten years

Reference: Sahih al-Bukhari 4464, Book of Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi). English translation by Dr. Muhammad Muhsin Khan.