Tafsir Ibn Kathir -> Surah Al-A'raf -> Allah mentions the rebellion, defiance and stubbornness of Hud's people, and their opposition to him, peace be upon him,

﴿قَالُواْ أَجِئْتَنَا لِنَعْبُدَ اللَّهَ وَحْدَهُ﴾

(They said: "You have come to us that we should worship Allah Alone'') Later on, the disbelievers of Quraysh said,

﴿وَإِذْ قَالُواْ اللَّهُمَّ إِن كَانَ هَـذَا هُوَ الْحَقَّ مِنْ عِندِكَ فَأَمْطِرْ عَلَيْنَا حِجَارَةً مِّنَ السَّمَآءِ أَوِ ائْتِنَا بِعَذَابٍ أَلِيمٍ ﴾

(And (remember) when they said: "O Allah! If this (the Qur'an) is indeed the truth (revealed) from You, then rain down stones on us from the sky or bring on us a painful torment.'') Muhammad bin Ishaq said that the people of Hud used to worship several idols, such as Suda', Samud and Al-Haba'. This is why Hud, peace be upon him, said to them,

﴿قَدْ وَقَعَ عَلَيْكُم مِّن رَّبِّكُمْ رِجْسٌ وَغَضَبٌ﴾

("Rijs and wrath have already fallen on you from your Lord.'') you deserve `Rijs' from your Lord because of what you said. Ibn `Abbas said that, `Rijs', means scorn and anger.

﴿أَتُجَـدِلُونَنِي فِى أَسْمَآءٍ سَمَّيْتُمُوهَآ أَنتُمْ وَءَابَآؤكُمُ﴾

("Dispute you with me over names which you have named -- you and your fathers'') ﴿7:71﴾. Hud said, do you dispute with me over these idols that you and your fathers made gods, even though they do not bring harm or benefit; did Allah give you authority or proof allowing you to worship them Hud further said,

﴿مَّا نَزَّلَ اللَّهُ بِهَا مِن سُلْطَـنٍ فَانتَظِرُواْ إِنِّى مَعَكُم مِّنَ الْمُنتَظِرِينَ﴾

("with no authority from Allah Then wait, I am with you among those who wait.'') this is a threat and warning from the Messenger to his people.