Dalil

Quran Al-Baqarah 2:245

مَّن ذَا ٱلَّذِي يُقۡرِضُ ٱللَّهَ قَرۡضًا حَسَنٗا فَيُضَٰعِفَهُۥ لَهُۥٓ أَضۡعَافٗا كَثِيرَةٗۚ وَٱللَّهُ يَقۡبِضُ وَيَبۡصُۜطُ وَإِلَيۡهِ تُرۡجَعُونَ

Translation

Who is it that would loan Allāh a goodly loan so He may multiply it for him many times over? And it is Allāh who withholds and grants abundance, and to Him you will be returned.