The Repentance - 9:118
(He accepted the repentance) of those three who remained behind. The earth had become narrow for them despite its vastness. They were overwhelmed. At last they realized that they could not escape Allah. So He turned to them to turn to Him. Allah is the All-Approving, All-Merciful.
The condition of those who fight in the way of Allah:
The Family Of Imran/3:157
If you die or are killed in the way of Allah, you will have Allah´s forgiveness and mercy, which is better than all that they gather.
The Family Of Imran/3:195
"Their Lord answered them: "I will not leave unrewarded any of you who works, whether male or female; you are all equal. Those who emigrated, those who were expelled from their homes, those who were tortured and insulted in My way, those who fought and were killed... I will cover their evil deeds and place them in gardens with rivers flowing in them as a reward from Allah. The best reward is with Allah."
The Women/4:74
Let those who exchange the life of this world for the Hereafter fight in the way of Allah. Whoever fights in the way of Allah and dies or is defeated, We shall give him a great reward.
The Repentance/9:20
For those who believe and emigrate and strive in the Way of Allah with their money and their lives, there is a higher degree with Allah. They are the winners.
The Repentance/9:21
Their Lord gives them glad tidings of mercy and approval from Him and of Gardens in which are everlasting blessings.
The Repentance/9:111
Allah has purchased the lives and property of the believers for Paradise. They fight and kill and are killed in the Way of Allah. This is His promise in the Torah, the Gospel and the Qur´an. Who better than Allah can fulfill His promise? So rejoice in this exchange. This is the greatest success.
The Women/4:100
Whoever migrates in the way of Allah will find abundance and plenty of shelter in the earth. And whoever leaves his home to migrate to Allah and His Messenger and then death overtakes him, it is for Allah to reward him. Allah is Forgiving, Merciful.
The Spoils of War/8:74
Those who believe, those who emigrate and strive in the Way of Allah and those who shelter and help them, these are the true believers. For them is forgiveness and abundant provision.