The Book of Prayer - Travellers
وَحَدَّثَنِي عُبَيْدُ اللَّهِ بْنُ مُعَاذٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا شُعْبَةُ، بِهَذَا الإِسْنَادِ . نَحْوَهُ وَلَمْ يَذْكُرْ إِنَّمَا شَكَّ شُعْبَةُ . وَمَا بَعْدَهُ .Shu'ba reported this hadith with the same chain of transmitters, but he made no mention that Shu'ba was in doubt and what follows subsequently
From Sahih Muslim, whose reports the scholars accept as authentic.