Abdullah bin Umar reported: I went to Messenger of Allah (may peace be upon him) in the morning and he heard the voice of two persons who had an argumentation with each other about a verse. Prophet (may peace be upon him) came to us (and) the (signs) of anger could be seen on his face. He said: Verily, the (peoples) before you were ruined because of their disputation in the Book.
Sahih Muslim, The Book of Knowledge #6443

   Say: If it be that your fathers, your sons, your brothers, your mates, or your kindred; the wealth that ye have gained; the commerce in which ye fear a decline: or the dwellings in which ye delight - are dearer to you than Allah, or His Messenger, or the striving in His cause - then wait until Allah brings about His decision: and Allah guides not the rebellious. Al-Quran 9:24, Surah At-Tawbah

   O Allah, save me from the mischief of my soul and let me have a firm conviction of virtue in all my matters. O Allah, forgive me for the sins I have committed secretly, openly, mistakenly, deliberately and ignorantly.