Thirteen is the number that follows twelve and often has a negative connotation in the world.
Positive: Dreaming of the number thirteen could represent love or a covenant. It could also represent circumcision of the heart.
Negative: Seeing the number thirteen in a dream could signify rebellion, rejection, backsliding, revolution, and stubbornness.
(Genesis 14:4; Esther 9:11; 1 Kings 7:1; Leviticus 11; Genesis 17).