Wicca doesn't have a Bible per se; instead, there are certain texts--chants, poems, etc.--which they consider sacred. I've collected them here for convenience.

• Wiccan Rede
• The Charge of the Goddess
• The Charge of the God
• The Charge of the Dark Goddess
• The Song of the Goddess
• The Witches' Rede
• Before Time Was
• Witches' Rune
• Principles of Wiccan Belief

Disclaimer: I am not a Wiccan; I just find it interesting. Why do I disclaim this? Paranoia. I've nothing against Wiccans; if I did, why would I post this?