Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
حَدَّثَنَا عَبْدَانُ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا عَاصِمٌ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ، رضى الله عنهما قَالَ أَقَامَ النَّبِيُّ صلى الله عليه وسلم بِمَكَّةَ تِسْعَةَ عَشَرَ يَوْمًا يُصَلِّي رَكْعَتَيْنِ.Narrated Ibn `Abbas:The Prophet (ﷺ) stayed in Mecca for 19 days during which he prayed 2 rak`at in each prayer
From Sahih al-Bukhari, whose reports the scholars accept as authentic.