The Messenger Of Allah (sallallaahu alayhi wa sallam) said:
“I guarantee a house on the outskirts of Paradise for he who leaves arguing even if he is right; and a house in the middle of Paradise for he who leaves lying even when joking; and a house in the highest part of Paradise for he who makes his character excellent.”
Sunan Abu Dawud, Book of Manners, Number 4800, (Hasan)
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