Spending money for the sake of God is the means of nearness to him!

Verses 97-99 of Chapter 9:

The bedouins are the worst in disbelief and hypocrisy, and more likely to not know the limits which Allah has revealed to His Messenger. And Allah is All-Knower, All-Wise. And of the bedouins there are some who look upon what they spend (in Allah's cause) as a fine and watch for calamities for you, on them be the calamity of evil. And Allah is All-Hearer, All-Knower. And of the bedouins there are some who believe in Allah and the Last Day, and look upon what they spend (in Allah's cause) as means of nearness to Allah, and a cause of receiving the Messenger's invocations. Indeed these (expenditures) are a means of nearness for them. Allah will admit them to His mercy. Certainly Allah is Oft-Forgiving, Most Merciful.