The Book of Drinks
وَحَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا ابْنُ أَبِي عَدِيٍّ، ح وَحَدَّثَنِيهِ مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى بْنُ حَمَّادٍ، كِلاَهُمَا عَنْ شُعْبَةَ، بِهَذَا الإِسْنَادِ وَلَمْ يَشُكَّا فِي إِلْقَاءِ النَّوَى بَيْنَ الإِصْبَعَيْنِ .This hadith has been narrated on the authority of Shu'ba with the same chain of transmitters and they did not doubt about keeping the dates between his fingers (as is expressed in the previous hadith)
From Sahih Muslim, whose reports the scholars accept as authentic.