God says
God invites unto the abode of peace* ….. Q10: 25
*‘Abode of peace’ not only denotes the condition of ultimate happiness in the hereafter (alluded to in the allegory of paradise) but also the spiritual condition of a true believer in this world: namely, a state of inner security, of peace with God, with natural environments and with oneself.
Hence, if two groups of believers fall to fighting* make peace between them; but then, if one of the two [groups] goes on acting wrongfully toward the other, fight against the one who acts wrongfully until it reverts to God’s commandment;** and if they revert, make peace between them with justice, and deal equitably [with them]: for God loves those who act equitably! - Q.49: 9*
The expression “fighting” comprises in this context all modes of discords and contention, both in word and deed, evidently as a consequence of the slanderous rumours spoken of in verse 6 earlier.** The believers should act as brethren.
Prophet said
1. “A believer is he in whom mankind has an asylum for their lives and properties” -- H: Bukhari and Muslim. N: Abdullah-b-Amr.
2. “Should I not inform you what is better in rank than the (voluntary) fasting, charity and (voluntary) prayer? (It is) to restore peace between the two. Dispute is destructive” -- H: Abu Daud and Tirmizi. N: Abu Darda.
3. “You shall not enter paradise till you believe; and you will not be believers till you love one another. Should I not guide you to something, which if you would do you would love one another? Spread peace among you.”— H: Muslim. N: Abu Huraira.