How can one get rid of feelings of hatred and envy towards others?

The cure for malice lies in giving gifts and shaking hands, as narrated from the Prophet, peace and blessings be upon him: "Exchange gifts, for a gift removes the rancor of the chest," and his saying: "Exchange gifts, you will love one another." And from Umar ibn Abd al-Aziz: "Shake hands, for it removes animosity." Likewise, fasting three days every month removes the rancor of the chest. And what cures envy also cures malice, for they are intertwined. Envy is a result of malice, and malice is a result of anger. Among the important remedies for envy is the prohibition against wishing for what Allah has favored some of you over others, and instead asking for His bounty.