They were at enmity with each other before the removing of the Old Law. Here again, we see that the antonyms of enmity are peace, friendship, and love. Continued in the instruction of this verse is the contrast between enmity and friendship. This time, the contradistinction of friendship with the one versus friendship with the other is brought out. Ye cannot serve God and mammon.
Evil gives birth to more evil.
From these six passages we ought to have gotten a good biblical definition of the word 'hatred'. There are many examples of hatred found within the pages of the Holy Writ. This eventually led to their selling him into slavery and deceiving their Jacob. Saul became jealous over David's victories and fame, then became angry and tried several times to murder him. Most were eventually murdered.