أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ صَالِحٍ ، حَدَّثَنِي اللَّيْثُ ، حَدَّثَنِي يُونُسُ ، عَنْ ابْنِ شِهَابٍ ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ ، عَنِ ابْنِ عَبَّاسٍ : أَنّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، قَالَ لِأَبِي بَكْرٍ : "لَا تُقْسِمْ ".
قَالَ أَبُو مُحَمَّدٍ : الْحَدِيثُ فِيهِ طُولٌ

Abdullah bin Salih told us, Al-Layth told me, Yunus told me, on the authority of Ibn Shihab, on the authority of Ubayd Allah bin Abdullah, on the authority of Ibn Abbas: The Prophet, may God bless him and grant him peace, said to Abu Bakr: “Do not swear.”
Abu Muhammad said: The hadith is long.