The Book of Purification
وَحَدَّثَنَا إِسْحَاقُ، أَخْبَرَنَا زَكَرِيَّاءُ بْنُ عَدِيٍّ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَمْرٍو، عَنْ زَيْدِ بْنِ أَبِي أُنَيْسَةَ، عَنِ الْحَكَمِ، بِهَذَا الإِسْنَادِ مِثْلَهُ .This hadith is narrated by Ubaidullah b. 'Amr and Zaid b. Abu Unaisa with the same chain of transmitters
From Sahih Muslim, whose reports the scholars accept as authentic.