The Jewish Law is also known as the "Halakhah". It is known as a way of life instead of just a religion that talks about human beings, the universe, and God. There are many practices that are present in the said law. "Halakhah" means "the path that one walks". The Jewish law is known to have come from the rabbis, the Torah, and the custom and according to them, it moves every part of life.
Juliet knows that she is supposed to hate anyone from the house Montague. Their families are enemies because of the lords of each house and still, Juliet, a Capulet, fell in love with Romeo, who is a Montague.