The New Testament is full of staggering numbers of quotes and allusions to the Old. Its writers directly cite or make passing reference to all but four Old Testament books at least once: Ezra/Nehemiah (a single volume in Hebrew), Esther, Ecclesiastes and the Song of Solomon. If we are going to be technically correct, we should probably add Nahum to these, as I will shortly demonstrate.
So here’s a question for you: if the New Testament writers can find no reason to quote Nahum, what good is the book to Christians?