It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "The gates of the heaven are opened every Monday and Thursday, and every person who does not associate anything with Allah Almighty is forgiven, except a person in whose heart there is rancour towards his brother." He (peace and blessings be upon him) said: "It is said: I give these two respite until they reconcile."
And Jarir narrated to us from Suhayl that he narrated a similar hadith, except that Allah Almighty says: "Give these two respite until they reconcile," and this is said twice.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6396