I set out with Amr bin Sulay until we came to Hudhayfah. He said, "I heard the Messenger of Allah ﷺ say, 'This tribe of Mudar will not leave a single righteous servant of Allah on earth without testing him and destroying him, until Allah brings against them armies from among His servants who will humiliate them so thoroughly that they will be unable to defend even the tail-end of a small valley.'"
انطلقت أنا وعمرو بن صليع حتى أتينا حذيفة، قال: سمعت رسول الله ﷺ يقول: إن هذا الحي من مضر، لا تدع الله في الأرض عبدا صالحا إلا افتنته وأهلكته، حتى يدركها الله بجنود من عباده، فيذلها حتى لا تمنع ذنب تلعة.
Tayalisi narrated it (421), and from him Ahmad (23316), and Hakim graded it sahih (4/469–470). Both of them transmitted it through the route of Hisham Dastawai, from Qatada, from Abu Tufayl, who related it. The wording here follows Ahmad's version, while Hakim's version has a story at the beginning. Its chain of transmission is sahih. Hakim said, "Sahih according to the criteria of the two sheikhs."Regarding the word "dhanab" (tail), it carries two fathas and is in a genitive construction with "talah." Talah refers to the channel through which water flows from a higher place to a lower one. It has also been said to be one of those words with contradictory meanings, applying both to what slopes down from the land and to what rises above it. "The tails of the watercourses" means the lowest parts of the valleys. This is the utmost expression of their humiliation, describing them with lowliness, weakness, and lack of power, as if he were saying, so that they would not possess even the lowest part of a valley, let alone the towns and the authority to rule among the people. This was said by Sindi.