لِأَنَّ حُكْمَ أَهْلِ الْعِلْمِ، وَالَّذِي يُعْرَفُ مِنْ مَذْهَبِهِمْ فِي قَبُولِ مَا يَتَفَرَّدُ بِهِ الْمُحَدِّثُ مِنَ الْحَدِيثِ
Translation: This is because the scholars’ rule—what is known of their approach to accepting a hadith uniquely narrated by a transmitter—is as follows…
Tafarrud signifies that the report or an element of it is uniquely supplied by that transmitter; it is not by itself a verdict of correctness or error. The key is whether that particular narrator has demonstrated sufficient reliability elsewhere.