preceptive

adj

1. Of, pertaining to, or based on precepts

   “If it was necessary, that Christ as our surety should suffer the penalty of the law in our stead, because we have sinned; then it was also necessary that as our Surety, he should yield obedience to the preceptive part of the law also;”

2. instructive; didactic

   “It is altogether preceptive, barely containing the rules, without illustration from example. It is a system of rhetoric in the abstract.”