The Book of Tribulations and Portents of the Last Hour
حَدَّثَنَاهُ أَحْمَدُ بْنُ يُونُسَ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ رُفَيْعٍ، بِهَذَا الإِسْنَادِ وَفِي حَدِيثِهِ قَالَ فَلَقِيتُ أَبَا جَعْفَرٍ فَقُلْتُ إِنَّهَا إِنَّمَا قَالَتْ بِبَيْدَاءَ مِنَ الأَرْضِ فَقَالَ أَبُو جَعْفَرٍ كَلاَّ وَاللَّهِ إِنَّهَا لَبَيْدَاءُ الْمَدِينَةِ .This hadith has been narrated on the authority of 'Abdullah b. Rufai, with the same chain of transmitters (but with the addition of these words):" When I met Abu Ja'far I told him that she (simply) meant the plain ground. Thereupon Abu Ja'far said: No, by God, she meant the plain ground of Medina
From Sahih Muslim, whose reports the scholars accept as authentic.