In Freemasonry, the third degree that one may obtain is called Master Mason. I found a book claiming to contain the rituals and oath that the Mason has to perform. The book is called "Duncan's Ritual of Freemasonry", by Malcom C. Duncan, 1866.
According to the book, pages 95-96, the oath is as follows:
"I furthermore promise and swear, that I will stand to and abide by all laws, rules, and regulations of the Master Masons' Degree, and of the Lodge of which I may hereafter become a member, as far as the same shall come to my knowledge; and that I will ever maintain and support the constitution, laws, and edicts of the Grand Lodge under which the same shall be holden.
"All this I most solemnly, sincerely promise and swear, with a firm and steady resolution to perform the same, without any hesitation, mental reservation, or secret evasion of mind what-ever, binding myself, under no less penalty than that of having my body severed in two, my bowels taken from thence and burned to ashes, the ashes scattered before the four winds of heaven, that no more remembrance might be had of so vile and wicked a wretch as I would be, should I ever, knowingly, violate this my Master Mason's obligation. So help me God, and keep me steadfast in the due performance of the same."
I understand that the penalty for breaking the oath might be a hyperbole. However, I would like to know if this is indeed the oath that all Master Masons have to take. Additionally, have the oaths changed during the centuries?