John Calvin's Commentary on the Bible - Genesis 25:12
Verse 12 12.Now these are the generations of Ishmael. This narration is not superfluous. In the commencement of the chapter, Moses alludes to what was done for the sons of Keturah. Here he speaks designedly more at large, for the purpose of showing that the promise of God, given in the seventeenth chapter (Genesis 17:1,) was confirmed by its manifest accomplishment. In the first place, it was no common gift of God that Ishmael should have twelve sons who should possess rank and authority over... read more
Adam Clarke's Commentary on the Bible - Genesis 25:16
These are their names - By which their descendants were called. Their towns - places of encampment in the wilderness, such as have been used by the Arabs from the remotest times. Their castles, טירתם tirotham , their towers, probably mountain tops, fortified rocks, and fastnesses of various kinds in woods and hilly countries. read more