بَنُو ثَقِيفٍ يَتَفَتَّنُونَ أَبَدًا

1.
means يَتَحَارَبُونَ [i. e. The sons of Thakeef (the tribe so called) contend in war, one with another, ever].
2.
تَفَتَّنَنِى: see 5 in article عجب, where it is said to be synonym with تَصَبَّانِى.

Perseus ID: n32968