What prompted Scripture to elaborate at such length on the details of the story and its recapitulations? Evidently it wished to show how each one strove with all his might to set at nought Adonijah’s designs that the word of the Lord through His prophet should be fulfilled (as recounted in I Chronicles 28:5). [Our 15th century Sage, Don Isaac] Abravanel (see
us-israel.org/jsource/biography/Abravanel.html) however still has the following question to ask: “How came Nathan the prophet to doubt his own prophecy that Solomon would be king that he should feel that all this effort was necessary to further it?” It is very likely that the unusual detail into which the chapter enters was meant to answer the above question, to show that neither the prophet not those who received his message, relied on miracles, that the prophecy would be fulfilled by itself. They did not regard prophecy as freeing them from action, absolving them of responsibility for their destiny. On the contrary, they accepted the promise of God as obliging them to work and strive to the best of their ability and understanding towards its fulfillment.