Sahih Muslim 4933
صحيح مسلم#4933SahihIn a version of the tradition narrated on the authority of A'mash, we have the words:" They will share with you the reward (for Jihad)
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 33:228