Hadithcore
Sahih Muslim, 1897 c
sahih

A version of the tradition narrated on the authority of 'Alqama b. Murthad has a differently worded end:

It will be said to the Mujahid: Take from his noble deeds whatever you like. Then the Messenger of Allah (ﷺ) turned to us and asked: What do you think (will he leave anything)? - (i. e. he will take away everything).

وَحَدَّثَنَاهُ سَعِيدُ بْنُ مَنْصُورٍ، حَدَّثَنَا سُفْيَانُ، عَنْ قَعْنَبٍ، عَنْ عَلْقَمَةَ بْنِ مَرْثَدٍ، بِهَذَا الإِسْنَادِ ‏"‏ فَقَالَ فَخُذْ مِنْ حَسَنَاتِهِ مَا شِئْتَ ‏"‏ ‏.‏ فَالْتَفَتَ إِلَيْنَا رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ ‏"‏ فَمَا ظَنُّكُمْ ‏"‏ ‏.‏

References2 variants
In-Book Reference
Book 33, Hadith 205
USC-MSA web (English) reference
Book 20, Hadith 4675 (deprecated numbering scheme)