Abu Dawud

Benefits and Issues:
Jihad becomes an expiation for all the sins of the mujahid.
And in this way, he becomes deserving of Paradise.
Except if there are any rights of the servants (huquq al-‘ibad) upon him.
If these are not forgiven and there is any punishment, then it will be without the Fire.
For example, he may be detained in places like al-A‘raf, etc.
(Nawawi) And Allah knows best.

Urdu marginal note:
That is, the believer and the disbeliever, the dust of jihad and the fire of Hell, faith (iman) and envy (hasad) are mutually contradictory things. And contradictory things can neither coexist in this world nor in the Hereafter. This is an absolute principle.

Hadith Commentary: Benefits and Issues: A disbeliever, on account of his disbelief, will be cast into Hellfire for eternity, while his killer, if he is a Muslim and remains steadfast upon the straight path, does not commit major sins, or repents from them, then he will not enter Hellfire. However, if he is unable to maintain proper steadfastness upon the religion and commits major sins without repentance, then he will enter Hellfire to bear the punishment for his sins. But the status of both will be separate; they will not be together, so that the disbeliever could reproach him by saying, "You are with me as well—what benefit did your Islam give you?"

Hadith Commentary: Benefits and Issues: A Muslim who remains steadfast upon faith, but commits major sins (kaba'ir), if he does not receive forgiveness, he may enter Hell to undergo punishment. However, due to the difference in ranks, the place of a disbeliever (kafir) and that of such a Muslim cannot be the same, such that they could be together.