What are the emphatic elements in Verse 55 of Surah An-Nur?

The noble verse: "Allah has promised those among you who have believed and done righteous deeds that He will surely grant them succession [to authority] upon the earth just as He granted it to those before them and that He will surely establish for them their religion which He has approved for them and that He will surely substitute for them, after their fear, security, [for] they worship Me, not associating anything with Me. But whoever disbelieves after that - then those are the defiantly disobedient." (Surah (definition) An-Nur, 24:55) contains emphatic elements such as the lam of oath and the nun of emphasis in (ليستخلفنهم - layastakhlifannahum), (ليمكنن - layumakkinanna), and (ليبدلنهم - layubaddilannahum). Furthermore, Allah Almighty's promise itself is an affirmation that what is promised will undoubtedly come to pass.