Perhaps the Earliest Surviving Text of the Hippocratic Oath

Oxyrhyncus Papyrus 2547 is a fragment of the Hippocratic oath written in Greek in Egypt about 275 CE. It is preserved in the Wellcome Institute Library, London (WMS 5724). 

Conrad et al, The Western Medical Tradition 800 BC to AD 1800 (1995) Fig. 3, p. 21.