Those who believed and those who suffered exile and fought (and strove and struggled) in the path of Allah,- they have the hope of the Mercy of Allah: And Allah is Oft-forgiving, Most Merciful. Al-Baqarah 2:218 ⧉
Tafsir:
When the faithful are persecuted in this way, and forced to leave their homes, they sometimes even have to take to arms in self-defence. So when the believers were debarred from worship by the polytheists, they were repeatedly subjected to aggression, such circumstances compelled them at times to take up arms in self-defence. This was a two-sided process which separated the people of God from the enemies of God. On the one hand, some were exposed as servants only of themselves; for who else but one who has no fear of God—pursuing only his own selfish ends—would persecute God’s servants? On the other hand, out of this persecution came emigration and peaceful missionary struggle—acts of true faith on the part of those who remained devoted to God through all torment and oppression; there were others, of course, who, unable to withstand the pressure, forsook their faith. (That is, such persecution gave the believers the opportunity to show the strength of their faith, and in spite of the adverse atmosphere, their continuing trust in God. This made them stand out from those who, weak in faith, proved unable to withstand the pressure, and lost their trust in God.)