31:6 But among people, there are those who invest their time in Hadith which is unfounded, so as to lead those without knowledge away from the path of God, making mockery of it (the Qur’an). For such there is a humiliating punishment in store.
On the question of taking second wife , Qur’an clearly says
4:3 If you fear that you (the society) shall not be able to do justice with the orphans, (as may happen in times of war and political turbulence, the government shall announce a state of Emergency), then, in order to accommodate widows and orphans, men of sound finances and character shall be encouraged to marry these widows; two, three, and four (4:127). But, if you fear that you shall not be able to deal justly, then, you must not take additional wives, and may continue with what you already have (4:129). This will be more suitable to prevent you from doing injustice and face financial hardship. [Second marriage during peace time is a frank violation of the Qur’an – note ‘if you fear’ …]
45:6 These are the verses of God We convey to you with truth. Then, in what HADITH, if not in God and His verses, will they believe?