You should apologize to her unless this will cause more harm than good, and talk nice about her in front of the same peoples you backbite her before.

We were went to vocation for 1 mounth so we stayed in my uncles house but wife of my uncle she is very bad. She likes to gossip about others she likes to takes things from others etc… After vacation I kept inside of me but recently I told my aunt and other realatives that’s she is very bad person she said this about you and etc..

Backbiting | December 6, 2014 2:26 pm
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Is it BACKBITING if a muslim woman tells her “husband” and other sisters etc. about a sister she went to visit at a hospital that was BREASTFEEDING her newborn infant at a hospital. She told the breastfeeding mother that its forbidden to breastfeed in front of others. How true is this?
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If someone tells me something about a third person and ask me not to disclose to anyone else then if I tell it to a fourth person will I be sinful?