Punishment of those who quarrel with one another
Punishment of those who quarrel with one another
89) Narrated Abu Huraira : Allah's Messenger said: Every Monday and Thursday, the gates of Paradise are open. Allah forgives every slave who associates no name in worship with Him except those who quarrelled with one another. Allah says to the angels: Leave them until they reconcile.
(This Hadfth is good and reported by Ahmad in his Musnady ).
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As you may understand from this Hadith, if you quarrel with a Muslim you have to reconcile within three days. If you go on abandoning him, this is a great sin that prevents reward for even your good deeds until you have reconciled.