The Book of Fasting
وَحَدَّثَنَاهُ عَبْدُ بْنُ حُمَيْدٍ، حَدَّثَنَا أَبُو عَامِرٍ عَبْدُ الْمَلِكِ بْنُ عَمْرٍو، حَدَّثَنَا إِبْرَاهِيمُ، بْنُ طَهْمَانَ بِهَذَا الإِسْنَادِ غَيْرَ أَنَّهُ قَالَ فَنَادَيَا .This hadith has been narrated on the authority of Ibrahim b. Tahman with the same chain of transmitters but with this variation that he said:Both of them made the announcement
From Sahih Muslim, whose reports the scholars accept as authentic.