He, sallallaahu ‘alayhi wa sallam, showed that performing many acts of worship does not benefit one who harms his neighbor:

“O Messenger of Allah, there is a woman who is known for praying, fasting and giving a great deal of charity, but she harms her neighbors with her speech.” The Prophet of Allah, sallallaahu ‘alayhi wa sallam, said: “She is in the Fire.” The man then said: “O Messenger of Allah, there is a woman who is known for very little fasting, charity, and prayer, and gives charity with only small pieces of dried milk, but she does not harm her neighbors with her speech.” The Prophet of Allah, sallallaahu ‘alayhi wa sallam, said: “She is in Paradise.”