Abbas - Tanwîr al-Miqbâs min Tafsîr Ibn ‘Abbâs
(He said: O my people! Bethink you: if I am (acting) on clear proof from my Lord) a clear exposition that has come down from my Lord (and there hath come unto me a mercy from Him) and He has favoured me with prophethood and Islam, (who will save me) who will defend me (from Allah) from Allah's chastisement (if I disobey Him) and shun His command? (Ye would add to me naught save perdition) I only increase in insight about your loss.
He said, ‘O my people, have you considered: if I am [acting] upon a clear proof, a [clear] statement, from my Lord, and He has given me from Him mercy, prophethood, who will help me, [who will] defend me, against God, [against] His chastisement, if I disobey Him? You would only be adding, by commanding me to do that, to my loss, [my] misguidance.
(and there has come to me a mercy from Him, who then can help me against Allah, if I were to disobey Him) `and abandon calling you to the truth and the worship of Allah alone. If I did so, you would not be able to bring me any benefit, nor increase me
(but in loss.)' This means loss and ruin.
Maududi - Sayyid Abul Ala Maududi - Tafhim al-Qur'an
This is the answer to the preceding question: "If I disobey Allah by discarding the Guidance I have received from Him in order to please you, you cannot defend me against Him. You will rather add to the intensity of my guilt of disobedience to Him. Thus I shall incur additional punishment from Him for misleading you instead of showing the Right Way for which I had been sent to you.