Biblical hermeneutics is the study of the principles of interpretation of the Bible. Christian mythology is the body of myths associated with Christianity and the Bible. Apocrypha are well attested in surviving manuscripts of the Christian Bible. Christian apologists defend and comment on various books of the Bible. There are numerous references to circumcision in the Hebrew Bible. There are no explicit references to archangels in the canonical texts of the Hebrew Bible. There are a number of references to prostitution in the Hebrew Bible. There are no personality traits described as being unique to women in the Hebrew Bible. Most are derived from Syriac transliterations of the Hebrew Bible. The number of sons mentioned by name in the Hebrew Bible is 19. Myrrh is mentioned as a rare perfume in several places in the Hebrew Bible. There are "practically nil" roles assigned to demons in the Hebrew Bible. He wrote commentaries on all the books of the Bible. There was no mention of God, the Bible, or sacred events. There are 81 books in the Ethiopian Orthodox Bible.