Berachos 3b - Part 6, Berachos 4a - Part 1

The gemara previously stated that the servants of King David asked Achitofel, the Sanhedrin, and the Urim V'Tumim about going out to war.

Rav Yosef brings a pasuk to support this. The pasuk in Divrei HaYamim Alef 27 lists Achitofel, Benayahu ben Yehoyada, Evyasar, and then the general Yoav. Achitofel is the adviser. This is clear from a pasuk in Shmuel Beis 16 that says that Achitofel's advice was sought after like the word of God. Benayahu ben Yehoyada refers to the Sanhedrin. Evyasar refers to the Urim V'Tumim. There is also a pasuk along these lines in Shmuel Beis 20 that says that Benayahu ben Yehoyada was over the "Kreisi U'pleisi". They are called the Kreisi U'pleisi because their words of clear-cut (kreisi) and amazing (pleisi). After them came the general to the king, Yoav.

Rav Yitzchak bar Abba, and some say Rav Yitzchak bar Rav Iddi, now asks, what pasuk tells us about the harp that woke up King David? It is the pasuk in Tehillim 27 which says that the harp awakens him in the morning.