Whether in the Old Law there should have been given precepts of faith?
Objections
❌ Objection 1 : It would seem that, in the Old Law, there should have been given precepts of faith. Because a precept is about something due and necessary. Now it is most necessary for man that he should believe, according to Heb. 11:6, "Without faith it is impossible to please God." Therefore there was very great need for precepts of faith to be given.
❌ Objection 2 : Further, the New Testament is contained in the Old, as the reality in the figure, as stated above (FS, Question [107], Article [3]). Now the New Testament contains explicit precepts of faith, for instance Jn. 14:1: "You believe in God; believe also in Me." Therefore it seems that some precepts of faith ought to have been given in the Old Law also.
❌ Objection 3 : Further, to prescribe the act of a virtue comes to the same as to forbid the opposite vices. Now the Old Law contained many precepts forbidding unbelief: thus (Ex. 20:3): "Thou shalt not have strange gods before Me," and (Dt. 13:1-3) they were forbidden to hear the words of the prophet or dreamer who might wish to turn them away from their faith in God. Therefore precepts of faith should have been given in the Old Law also.
❌ Objection 4 : Further, confession is an act of faith, as stated above (Question [3], Article [1]). Now the Old Law contained precepts about the confession and the promulgation of faith: for they were commanded (Ex. 12:27) that, when their children should ask them, they should tell them the meaning of the paschal observance, and (Dt. 13:9) they were commanded to slay anyone who disseminated doctrine contrary to faith. Therefore the Old Law should have contained precepts of faith.
❌ Objection 5 : Further, all the books of the Old Testament are contained in the Old Law; wherefore Our Lord said (Jn. 15:25) that it was written in the Law: "They have hated Me without cause," although this is found written in Ps. 34 and 68. Now it is written (Ecclus. 2:8): "Ye that fear the Lord, believe Him." Therefore the Old Law should have contained precepts of faith.