Chapter 52

About Doeg, who told Saul David was in the house of Ahimelech at Nob.  Doeg kills 85 men of God before the episode is over.  This is a sort of prophecy about what Doeg has in store for him from God for what he has done.  A search for "Doeg" in the MSB did not turn up any fulfillment of this prediction in the OT. 

2023 - This verse, where David declares himself "like a green olive tree".  This is important because of the two olive trees in Revelation, the two witnesses, and the references in Zechariah.  This is the first time I have seen David call himself one of these:

8 But I am like a green olive tree in the house of God. I trust in the steadfast love of God forever and ever. [Psa 52:8 ESV].  It seems unlikely that David would come back as one of the witnesses, but we cannot dismiss it outright, especially given this verse.