It was narrated from Abu Hurairah that the Messenger of Allah ﷺ said:
“Allah has prepared (reward) for those who go out (to fight) in His cause: ‘And do not go out except (to fight) for Jihad in My cause, out of faith in Me and belief in My Messengers, but he has a guarantee from Me that I will admit him to Paradise, or I will return him to his dwelling from which he set out, with the reward that he attained, or the spoils that he acquired.’ Then he said: ‘By the One in Whose Hand is my soul, were it not that it would be too difficult for the Muslims, I would never have stayed behind from any expedition that went out in the cause of Allah. But I could not find the resources to give them mounts and they could not find the resources to follow me, nor would they be pleased to stay behind if I went. By the One in Whose Hand is the soul of Muhammad, I wish I could fight in the cause of Allah and be killed, then fight and be killed, then fight and be killed.’”

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ فُضَيْلٍ، عَنْ عُمَارَةَ بْنِ الْقَعْقَاعِ، عَنْ أَبِي زُرْعَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ﷺ " أَعَدَّ اللَّهُ لِمَنْ خَرَجَ فِي سَبِيلِهِ لاَ يُخْرِجُهُ إِلاَّ جِهَادٌ فِي سَبِيلِي وَإِيمَانٌ بِي وَتَصْدِيقٌ بِرُسُلِي فَهُوَ عَلَىَّ ضَامِنٌ أَنْ أُدْخِلَهُ الْجَنَّةَ أَوْ أَرْجِعَهُ إِلَى مَسْكَنِهِ الَّذِي خَرَجَ مِنْهُ نَائِلاً مَا نَالَ مِنْ أَجْرٍ أَوْ غَنِيمَةٍ " . ثُمَّ قَالَ " وَالَّذِي نَفْسِي بِيَدِهِ لَوْلاَ أَنْ أَشُقَّ عَلَى الْمُسْلِمِينَ مَا قَعَدْتُ خِلاَفَ سَرِيَّةٍ تَخْرُجُ فِي سَبِيلِ اللَّهِ أَبَدًا وَلَكِنْ لاَ أَجِدُ سَعَةً فَأَحْمِلَهُمْ وَلاَ يَجِدُونَ سَعَةً فَيَتَّبِعُونِي وَلاَ تَطِيبُ أَنْفُسُهُمْ فَيَتَخَلَّفُونَ بَعْدِي وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ لَوَدِدْتُ أَنْ أَغْزُوَ فِي سَبِيلِ اللَّهِ فَأُقْتَلَ ثُمَّ أَغْزُوَ فَأُقْتَلَ ثُمَّ أَغْزُوَ فَأُقْتَلَ " .