Maliks Muwatta Book 58, Hadith Number 12.

Section : Refraining from Asking.

Yahya related that Malik heard al-Ala ibn Abd ar-Rahman say, “Sadaqa does not decrease property, and Allah only increases a slave in worth for his restraint, and no slave is humble but that Allah raises him.”

Malik said, “I do not know whether this hadith goes back to the Prophet, may Allah bless him and grant him peace, or not.”