LEV547 "You must not hate your brother in your heart" [this verse]. We have been admonished herein to remove the trait of hatred from within ourselves. This trait is the cause of many iniquities, and leads to many corrupt activities -- such as lashon hara (See the First Gate, note 26), which equals certain sins that require the death penalty, as we will explain (See paragraph 201); seeking [another's] evil; rejoicing over another's misfortune; causing harm to others; causing ill will; revenge; and bearing a grudge -- and to the loss of much good from the soul, as will be explained in The Gate of Hatred (See the First Gate, note 97). See how far the punishment of hatred extended, for our Sages, z"l, said (Yoma 9b), "Why was the second Beis HaMikdash destroyed, [even though the people] engaged in Torah study and good deeds? Because of the baseless hatred that existed between them."