ENOfficial
Qutaiba b. Sa'id and Zubair b. Harb say: Jarir narrated this on the authority of A'mash with the same chain of narrators (as mentioned above).
Source: sunnah.com
Other translations
Arabic
وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالاَ حَدَّثَنَا جَرِيرٌ، عَنِ الأَعْمَشِ، بِهَذَا الإِسْنَادِ وَلَمْ يَذْكُرْ " رَأْسُ الْكُفْرِ قِبَلَ الْمَشْرِقِ " .
sunnah.com