Tafsir of An-Naml 27:70

وﻻ تحزن عليهم

And grieve you not over them, meaning, `but do not feel sorry for them or kill yourself with regret for them,'

وﻻ تكن في ضيق مما يمكرون

nor be straitened because of what they plot. means, `because they plot against you and reject what you have brought, for Allah will help and support you, and cause your religion to prevail over those who oppose you and stubbornly resist you in the east and in the west.'