Which of the following is not the golden rule of ethics ?

The Golden Rule of Ethics (ethic of reciprocity) is expressed positively as "Everything you want others to do to you, you shall do to others." and in its negative (Silver Rule) formulations as "Do not do to others that which you do not wish them to do to you." and "Do not do anything to others that if done to you would cause harm to you." By contrast, "Do not leave the opportunity of earning profit." expresses opportunistic profit-seeking rather than an ethical rule.