Furthermore, they started to accuse Hud of being a crazy lunatic. One day they told him: "We now understand the secret of your madness: you insulted our gods and they harmed you; that is why you have become insane."
Almighty Allah repeated their words in the Qur'an: "0 Hud! No evidence have you brought us, and we shall not leave our gods for your (mere) saying! And we are not believers in you. All that we say is that some of our gods false deities) have seized you with evil (madness). Surah 11: 53-54
Hud had to return their challenge. He had no other way but to turn to Allah alone, no other alternative but to give them a threatening ultimatum. He declared to them: "I call Allah to witness and bear you witness that I am free from that which you ascribe as partners in worship with Him (Allah). So plot against me, all of you and give me no respite. I put my trust in Allah, my Lord and your Lord! There is not a moving (living) creature but He has grasp of its forelock. Verily, my Lord is on the Straight Path (the truth). So if you turn away, still I have conveyed the message with which I was sent to you. My Lord will make another people succeed you, and you will not harm Him." Surah 11: 54-57