The Hippocratic oath covers several important ethical issues between doctors and patients. The oath first establishes that the practitioner of medicine give deference to the creators, teachers, and learners of medicine. … The oath serves as a contract for doctors to work towards the benefit of the health of the public.
The Hippocratic Oath is an oath historically taken by physicians . It is one of the most widely known of Greek medical texts. In its original form, it requires a new physician to swear . . . to uphold specific ethical standards. The Oath is the earliest expression of medical ethics in the Western world, establishing several principles of medical ethics which remain of paramount significance today. These include the principles of medical confidentiality  and non-maleficence . Although the ancient text is only of historic and symbolic value, swearing a modified form of the Oath remains a rite of passage for medical graduates in many countries.
Hippocrates  is often called the father of medicine in Western culture .  The original oath was written in Ionic Greek , between the third and fifth centuries BC.  It is usually included in the Hippocratic Corpus .
Earliest surviving copy version of the Hippocratic Oath, in . . . the English translation is as follows:
I swear by Apollo  the Healer, by Asclepius , by Hygieia , by Panacea , and by all the gods and goddesses, making them my witnesses, that I will carry out, according to my ability and judgment, this oath and this indenture.
To hold my teacher in this art equal to my own parents; to make him partner in my livelihood; when he is in need of money to share mine with him; to consider his family as my own brothers, and to teach them this art, if they want to learn it, without fee or indenture; to impart precept, oral instruction, and all other instruction to my own sons, the sons of my teacher, and to indentured pupils who have taken the physician’s oath, but to nobody else.
I will use treatment to help the sick according to my ability and judgment, but never with a view to injury and wrong-doing. Neither will I administer a poison to anybody when asked to do so, nor will I suggest such a course. Similarly, I will not give to a woman a pessary to cause abortion. But I will keep pure and holy both my life and my art. I will not use the knife, not even, verily, on sufferers from stone , but I will give place to such as are craftsmen therein.
Into whatsoever houses I enter, I will enter to help the sick, and I will abstain from all intentional wrong-doing and harm, especially from abusing the bodies of man or woman, bond or free. And whatsoever I shall see or hear in the course of my profession, as well as outside my profession in my intercourse with men, if it be what should not be published abroad, I will never divulge, holding such things to be holy secrets.
Now if I carry out this oath, and break it not, may I gain for ever reputation among all men for my life and for my art; but if I transgress it and forswear myself, may the opposite befall me.  – Translation by James Loeb .
Source: https://en.wikipedia.org/wiki/Hippocratic_Oath 
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