Chiasmus
Chiasmus (ki*az"mus) , noun
[New Latin, from Greek chiasmo`s a placing crosswise, from chia`zein. See Chiasm.]
(Rhetoric) An inversion of the order of words or phrases, when repeated or subsequently referred to in a sentence
If e'er to bless thy sons
My voice or hands deny,
These hands let useful skill forsake,
This voice in silence die.