وَمِنَ الْأَعْرَابِ مَن يَتَّخِذُ مَا يُنفِقُ مَغْرَمًا وَيَتَرَبَّصُ بِكُمُ الدَّوَائِرَ ۚ عَلَيْهِمْ دَائِرَةُ السَّوْءِ ۗ وَاللَّهُ سَمِيعٌ عَلِيمٌ (98)
(9:98) There are such among the Bedouins, who regard what they expend in the Way as a penalty *96 and await some change of fortune to turn against you (so that they should be able to overthrow the government you have imposed on them,whereas they themselves have been encircled by a vicious circle; and Allah hears everything and knows everything.
*96) This means that they regarded the payment of Zakat dues as a fine and the expenditure on hospitality, an Islamic duty, a penalty. Likewise, if they had to make any contributions towards Jihad, they did so to show that they were loyal to the Islamic State and not because they wanted to please Allah by giving sincere monetary help for His cause.