Oneness, Uniqueness of Allah (Tawheed)
حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا مِسْعَرٌ، عَنْ عَدِيِّ بْنِ ثَابِتٍ، أُرَاهُ عَنِ الْبَرَاءِ، قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقْرَأُ فِي الْعِشَاءِ {وَالتِّينِ وَالزَّيْتُونِ} فَمَا سَمِعْتُ أَحَدًا أَحْسَنَ صَوْتًا أَوْ قِرَاءَةً مِنْهُ.Narrated Al-Bara':I heard the Prophet (ﷺ) reciting Surat at-Tin waz Zaitun (By the Fig and the Olive) in the `Isha' prayer and I have never heard anybody with a better voice or recitation than his
From Sahih al-Bukhari, whose reports the scholars accept as authentic.