Voluntary charity and spending in Allah's path (infaq)

مَّن ذَا ٱلَّذِى يُقْرِضُ ٱللَّهَ قَرْضًا حَسَنًا فَيُضَـٰعِفَهُۥ لَهُۥ وَلَهُۥٓ أَجْرٌ كَرِيمٌ

Who is it that would loan Allāh a goodly loan so He will multiply it for him and he will have a noble reward?