These are the sons of Ishmael, and these are their names, by their towns, and by their castles; twelve princes according to their nations.
-- Gen. 25:16 (KJV)
This verse continues the talk about the sons of Ishmael. It states that they each built castles and made themselves princes of the Arabian nations that they founded. These castles are mentioned in ancient Assyrian inscriptions by the name of Adummatu, which is the current city of al-Jawf in Saudi Arabia.
Numerical Analysis: The numerical pattern for this verse is 7,5,2,1,6. (7) Be perfected by God in order to bear fruit. (5) To stay in God's presence, realize that callings are designated by names. (2) Walk in God's kingdom in order to have shelter. (1) To stay in the anointing, defend what you have. (6) Expose evil in order to have authority.