Sunan an-Nasa'i 3126
سنن النسائي#3126SahihIt was narrated from Ibn 'Umar, from the Prophet (ﷺ), of what he related from his Lord, the Mighty and Sublime:"And of My slaves who goes out as a Mujahid striving in the cause of Allah, seeking my pleasure, I guarantee that I will bring him back with whatever he had earned as reward or spoils of war, and if I take his (soul) I will forgive him and have mercy on him
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih
In-book reference: 25:42