Hadith.3691 - Abu Hamzah Al-Thumali narrated from Abu Ja'far Imam Muhammad ibn Ali Al-Baqir (as) that he said
"Whoever withholds the right of a Muslim while he is able to give it to him, out of fear that if he lets go of that right he might become poor, then Allah (swt), the Mighty and Exalted, is more capable of making him poor than he is of enriching himself by withholding that right."