Who is he that will lend to Allah a goodly loan (Qard Hasan) so that He may multiply it to him many times? And it is Allah that decreases or increases (your provision..." Surat AlBaqara, Aayah 245.
The Prophet (Peace be upon him) said: "No wealth will decrease from paying Sadaqah (donation). It would rather
increase it, increase it, increase it".Â