Who invented injective function?

Who exactly invented the concept of injective function? Was it a mathematician from a particular era, or perhaps a group of scholars collaborating on a project? Did the invention occur during a time of significant mathematical advancements, or was it a more isolated discovery? Was there a specific problem or question that led to the creation of this function, or was it more of a theoretical development? Could you provide some background information on the individual or group responsible for this significant mathematical concept?