What is "Avdecha" written with a Yud?
Radak: The Yud hints to the plural - me and your other faithful servants. (The pronunciation hints that) there was special reason to tell Nasan. Malbim - since Nasan had the Nevu'ah that Shlomo will reign, if David received a later Nevu'ah that Adoniyahu will reign, he should have told Nasan, lest Nasan doubt his own Nevu'ah, or suspect that David transgressed the Navi's words 1 !
Malbim: For full arousal, one must be aroused from all sides. Bas Sheva aroused envy and anger by magnifying Adoniyahu's sin, and Nasan aroused suspicion and shame via suggesting that David transgressed his Shevu'ah. (In verse 24, Malbim said that he pretended not to know that David swore!)
