Zechariah 8:16-19

These are the things that ye shall do: Speak ye every man the truth with his neighbor; execute the judgment of truth and peace in your gates; and let none of you devise evil in your hearts against his neighbor; and love no false oath: for all these are things that I hate, saith Jehovah. And the word of Jehovah of hosts came unto me, saying, Thus saith Jehovah of hosts: The fast of the fourth month, and the fast of the fifth, and the fast of the seventh, and the fast of the tenth, shall be to the house of Judah joy and gladness, and cheerful feasts; therefore love truth and peace.