preceptive

Etymology

precept + -ive

adj

1. (law) 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; 1677, John Owen, The Doctrine of Justification by Faith
2. instructive; didactic
   It is altogether preceptive, barely containing the rules, without illustration from example. It is a system of rhetoric in the abstract. 1810, John Quincy Adams, Lectures on Rhetoric and Oratory