﴿ وَمِنَ ٱلْأَعْرَابِ مَن يَتَّخِذُ مَا يُنفِقُ مَغْرَمًۭا وَيَتَرَبَّصُ بِكُمُ ٱلدَّوَآئِرَ ۚ عَلَيْهِمْ دَآئِرَةُ ٱلسَّوْءِ ۗ وَٱللَّهُ سَمِيعٌ عَلِيمٌۭ ﴾

“And among the bedouin there are such as regard all that they might spend [in God's cause] as a loss, and wait for misfortune to encompass you, [O believers: but] it is they whom evil fortune shall encompass - for God is all-hearing, all-knowing.”

Please check ayah 9:99 for complete tafsir.