Knowing the verses is not enough if the person doesn't know there correct implications

بسم الله والحمد لله والصلاة والسلام على رسول الله ، وبعد

Imaam al-Bukhaaree mentioned in his Saheeh:

Ibn `Umar رضي الله عنهما considered the Khawaarij and the heretics (al-Mulhideen) as the worst of Allaah’s creatures and said: “These people took some Verses that had been revealed concerning the disbelievers and interpreted them and applied them to the believers.”

[Ref: English Saheeh al-Bukhaaree Volume 9, Page No 49-50, Chapter on Killing the Khawaarij and the Mulhideen]