At-Taubah - 9:99

وَمِنَ الأَعْرَابِ مَن يُؤْمِنُ بِاللّهِ وَالْيَوْمِ الآخِرِ وَيَتَّخِذُ مَا يُنفِقُ قُرُبَاتٍ عِندَ اللّهِ وَصَلَوَاتِ الرَّسُولِ أَلا إِنَّهَا قُرْبَةٌ لَّهُمْ سَيُدْخِلُهُمُ اللّهُ فِي رَحْمَتِهِ إِنَّ اللّهَ غَفُورٌ رَّحِيمٌ
[9:99]
And of the dwellers of the desert are those who believe in Allah and the latter day and take what they spend to be (means of) the nearness of Allah and the Messenger's prayers; surely it shall be means of nearness for them; Allah will make them enter into His mercy; surely Allah is Forgiving, Merciful.
But some of the desert Arabs believe in Allah and the Last Day, and look on their payments as pious gifts bringing them nearer to Allah and obtaining the prayers of the Messenger. Aye, indeed they bring them nearer (to Him): soon will Allah admit them to His Mercy: for Allah is Oft-forgiving, Most Merciful.
And of the wandering Arabs there is he who believeth in Allah and the Last Day, and taketh that which he expendeth and also the prayers of the messenger as acceptable offerings in the sight of Allah. Lo! verily it is an acceptable offering for them. Allah will bring them into His mercy. Lo! Allah is Forgiving, Merciful.