The Book on Government
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، وَأَبُو مُعَاوِيَةَ عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ نَحْوَهُ .This hadith has been transmitted on the authority of A'mash
From Sahih Muslim, whose reports the scholars accept as authentic.