Hi, 'Gguider' is not a correct word here. Perhaps you mean 'guide'. However, a guide does not usually explain the rules of a system to people. So, I'm not sure what you r meaning is.
Usually a system has several rules, not just one rule.
Let's begin by comparing the verbs 'hear' and 'tell' very simply. Tom heard the news from Mary. Mary told Tom the news.
That were was just practice for improving my English.
So after your comment, I would say it like this.
I had been told over and over again the rule of the system by the instructor.OK I heard over and over again the rule of the system from the instructor. OK