Since it is customary during wars that many of the believers die, Allah says:

﴿وَالَّذِينَ قُتِلُواْ فِى سَبِيلِ اللَّهِ فَلَن يُضِلَّ أَعْمَـلَهُمْ﴾

(But those who are killed in the way of Allah, He will never let their deeds be lost.) which means that He would not let their good deeds go to waste, but would rather multiply and increase them. Some of them will continue being rewarded for their good deeds for the entire length of their stay in Al-Barzakh. This has been mentioned in a Hadith recorded by Imam Ahmad in his Musnad on the authority of Kathir bin Murrah, who reported from Qays Al-Judhami, may Allah be pleased with him, that Allah's Messenger said,

«يُعْطَى الشَّهِيدُ سِتَّ خِصَالٍ عِنْدَ أَوَّلِ قَطْرَةٍ مِنْ دَمِهِ: تُكَفَّرُ عَنْهُ كُلُّ خَطِيئَةٍ، وَيَرَى مَقْعَدَهُ مِنَ الْجَنَّةِ، وَيُزَوَّجُ مِنَ الْحُورِ الْعِين، وَيَأْمَنُ مِنَ الْفَزَعِ الْأَكْبَرِ، وَمِنْ عَذَابِ الْقَبْرِ، وَيُحَلَّى حُلَّةَ الْإِيمَان»

(As the first drop of his blood gushes forth, a martyr is granted six merits: all of his sins are forgiven, he is shown his place in Paradise, he is married to wide-eyed Huris, he is secured from the great fear (on Judgement Day) and the torment of the grave, and he is adorned with the adornments of Iman.) Ahmad was alone in recording this Hadith. Abu Ad-Darda', may Allah be pleased with him, reported that Allah's Messenger said,

«يُشَفَّعُ الشَّهِيدُ فِي سَبْعِينَ مِنْ أَهْلِ بَيْتِه»

(A martyr is allowed to intercede for seventy members of his household. ) This was recorded by Abu Dawud, and there are numerous other Hadiths mentioning the merits of the martyrs. As for Allah's saying,

﴿سَيَهْدِيهِمْ﴾

(He will guide them) meaning, He will guide them to Jannah. This is similar to Allah's saying,

﴿إِنَّ الَّذِينَ ءَامَنُواْ وَعَمِلُواْ الصَّـلِحَاتِ يَهْدِيهِمْ رَبُّهُمْ بِإِيمَانِهِمْ تَجْرِى مِن تَحْتِهِمُ الاٌّنْهَـرُ فِي جَنَّـتِ النَّعِيمِ ﴾

(Indeed, those who have believed and done righteous good deeds, their Lord will guide them because of their Faith: beneath them rivers will flow in the Gardens of Pleasure.) (10:9) Allah says,

﴿وَيُصْلِحُ بَالَهُمْ﴾

(and amend their condition.) meaning, their situation and affairs.

﴿وَيُدْخِلُهُمُ الْجَنَّةَ عَرَّفَهَا لَهُمْ ﴾

(And (He will) admit them to Paradise, which He has made known to them.) It means that He has acquainted them with Paradise and guided them to it. Mujahid said: "The people of Paradise will be guided to their houses and dwellings and whatever sections Allah has ordained for them in it. They will not make mistakes in this, nor will they ask anyone for directions to their dwellings -- as if they had dwelt in it from the time they were first created.'' Al-Bukhari recorded from Abu Sa`id Al-Khudri, may Allah be pleased with him, that Allah's Messenger said,

«إِذَا خَلَصَ الْمُؤْمِنُونَ مِنَ النَّارِ حُبِسُوا بِقَنْطَرَةٍ بَيْنَ الْجَنَّةِ وَالنَّارِ، يَتَقَاصُّونَ مَظَالِمَ كَانَتْ بَيْنَهُمْ فِي الدُّنْيَا، حَتْى إذَا هُذِّبُوا وَنُقُّوا أُذِنَ لَهُمْ فِي دُخُولِ الْجَنَّةِ، وَالَّذِي نَفْسِي بِيَدِهِ إِنَّ أَحَدَهُمْ بِمَنْزِلِهِ فِي الْجَنَّةِ أَهْدَى مِنْهُ بِمَنْزِلِهِ الَّذِي كَانَ فِي الدُّنْيَا»

(After the believers securely pass the Fire (on the Day of Judgement), they will be held back upon a bridge between Paradise and the Fire. There, they will have any acts of injustice that they committed against one another in the life of this world rectified. After they are completely purified and cleansed (from injustice), they will be admitted into Paradise. By the One in Whose Hand is my soul, each one of them will find his way to his dwelling in Paradise better than he found his way to his dwelling in the worldly life.)