Ah, you are fair, my darling, you are lovely. Your eyes are like doves behind your veil. - Song of Songs 4:1
Tu B'Av, the 15th Day of Av, is considered a day of joy and love. It once served as a matchmaking day for unmarried women in the Second Temple period. Tu'B'Av is a holiday that has been reinvigorated in Israel, becoming a day resembling Valentine's Day.