Final answer:
The phrase 'First, do no harm' is described by the pillar of ethics called Non-maleficence.
Step-by-step explanation:
The phrase 'First, do no harm' is described by the pillar of ethics called Non-maleficence. The principle of nonmaleficence states that we should act in ways that do not cause harm to others. In clinical settings, nonmaleficence requires that patients are not unnecessarily harmed and in research trials, it requires that trials are designed to limit harm to participants as much as possible.