Then if they (despite these blessings of God and His completing His favors upon them through this Revelation) turn away, what rests with you, (O Messenger,) is only to convey the Message fully and clearly
But if still these (opponents) turn away, you should know that upon you is (only the responsibility of) delivery (of the divine Message) in plain terms
So if (even then) they turn away, (O Glorious Messenger,) then your responsibility is only to convey and communicate (My message and My commands) clearly
But if they turn away from you (My Rasul) then the only responsibility upon you is to inform!
Sayyed Abbas Sadr-Ameli
So (O' Prophet!) if they turn away, then on you is (incumbent) only the clear conveyance (of the message) .
Al-muntakhab fi tafsir al-Qur'an al-Karim
Should they yet O Muhammad turn a deaf ear, you incur no blame, for you are responsible only for relating the divine message and the illucidation of its text