Sequence of Verses
Warnings of punishment against disbelief (kufr) - whether original or apostacy (irtidad) - appeared in previous verses. After that, in the first (106) of the initial three verses cited above, it has been pointed clearly that 'Iman or the declaration of faith is a wealth that could work wonders for a kafir (disbeliever) or murtadd (apostate) who - if he were to come up with an honest and true 'Iman - all his past sins would stand forgiven.
In the second verse An-Nahl 16:107 ⧉, the last day of Qiyamah was mentioned for the reason that all this phenomena of reward and punishment has to occur after that. In the third verse An-Nahl 16:108 ⧉, it was said that the real punishment of disbelief and sin will, though come after the Qiyamah, yet there are some sins the punishment of which is faced in a certain degree within the present world.