Some Arabs consider their spending (in the cause of God) to be a loss, and even wait in anticipation that a disaster may hit you. It is they who will incur the worst disaster. God is Hearer, Omniscient.
وَمِنَ الأَعرابِ مَن يَتَّخِذُ ما يُنفِقُ مَغرَمًا وَيَتَرَبَّصُ بِكُمُ الدَّوائِرَ عَلَيهِم دائِرَةُ السَّوءِ وَاللَّهُ سَميعٌ عَليمٌ
wa minal A’raabi mai yattakhizu maa yunfiqu maghramanw wa yatarabbasu bikumud dawaaa’ir; alaihim daaa’iratus saw’; wallaahu Samee’un ‘Aleem