There a stark change in direction from previous verses speaking of those who are doomed to reminding us of the resting place of those who have iman AND inclined toward/do good deeds (an essential combination). I'm always struck by the love that Allah has for the prophet (SAW) when he defends His beloved messenger so vehmently in verses such as verse 15. Verse 17 reminds me of a confidence believers are given which can relate back to the adab of d...