Before I start the Wiccan Creed, you need to know that this is a different piece of poetry from the better-known Wiccan Rede. Unfortunately, a lot of websites assume the two are the same thing. They're not.
This is the Wiccan Creed, which is also known as the Witches Creed:
now the words of the witches,
The secrets we hid in the night,
When dark was our destiny's pathway,
That now we bring forth into light.
Mysterious water and fire,
The earth and the wide-ranging air,
By hidden quintessence we know them,
And will and keep silent and dare.
The birth and rebirth of all nature,
The passing of winter and spring,
We share with the life universal,
Rejoice in the magical ring.
Four times in the year the Great Sabbat
Returns, and the witches are seen
At Lammas and Candlemas dancing,
On May Eve and old Hallowe'en.
When day-time and night-time are equal,
When sun is at greatest and least,
The four Lesser Sabbats are summoned,
And Witches gather in feast.
Thirteen silver moons in a year are,
Thirteen is the coven's array.
Thirteen times at Esbat make merry,
For each golden year and a day.
The power that was passed down the age,
Each time between woman and man,
Each century unto the other,
Ere time and the ages began.
When drawn is the magical circle,
By sword or athame of power,
Its compass between two worlds lies,
In land of the shades for that hour.
This world has no right then to know it.
And world of beyond will tell naught.
The oldest of Gods are invoked there,
The Great Work of magic is wrought.
For the two are mystical pillars,
That stand at the gate of the shrine,
And two are the powers of nature,
The forms and the forces divine.
The dark and the light in succession,
The opposites each unto each,
Shown forth as a God and a Goddess:
Of this our ancestors teach.
By night he's the wild winds rider,
The Horn'd One, the Lord of the Shades.
By day he's the King of the Woodland,
The dweller in green forest glades.
She is youthful or old as she pleases,
She sails the torn clouds in her barque,
The bright silver lady of midnight,
The crone who weaves spells in the dark.
The master and mistress of magic,
That dwell in the deeps of the mind,
Immortal and ever-renewing,
With power to free or to bind.
So drink the good wine to the Old Gods,
And Dance and make love in their praise,
Till Elphame's fair land shall receive us
In peace at the end of our days.
And Do What You Will be the challenge,
So be it Love that harms none,
For this is the only commandment.
By Magic of old, be it done!
Just like with any other witchcraft texts, this isn't any sort of official "scripture" that anyone has to abide by. It's just a lovely poem that represents a lot of Wiccan ideals and Pagan beliefs.