whereas there is not any blame on you-if he is not cleansed.
Even though you could not guarantee his salvation
although it is not for you to be concerned if he remained unpurified
And no blame is on thee, if he purify himself not
And it (is) not on you that he not purifies/corrects (himself)
if he does not choose the right way
And you have nothing to lose if he does not become pure
Though thou art not responsible if he does not become purified
Whereas there is no (burden of) responsibility on you, even if he does not adopt purification (i.e., faith)
Though you are not to blame if he does not purify himself
What does it matter to you if he will not become pure (from disbelief, you are only a Messenger, your duty is to convey the Message of Allah)