Masma’ Ibn A’bd al-Malik relates:
We were in the company of Imam Sadiq (peace be upon him) at Mina (where the Pilgrims halt during Hajj) and engaged in eating grapes that lay before us in a vessel when a beggar approached us and asked the Imam (peace be upon him) for some help.
The Imam (peace be upon him) ordered a bunch of grapes to be given to him. When the grapes were offered to him, the beggar refused saying: I am not in need of this. I require dirhams.
The Imam (peace be upon him) said: May God increase your sustenance. The beggar departed but returned shortly and said: Give me that bunch of grapes. The Imam (peace be upon him) said: May God increase your livelihood, but this time did not give him any grapes.
Not very long afterwards, another beggar arrived and asked him for something to be given to him. The Imam (peace be upon him) picked up three grapes with his own hands and handed them to him. The beggar took the grapes and said: Praise be to the God of the Worlds, Who provided me these grapes.
Hearing this, the Imam (peace be upon him) said to him: Wait.
Then filling his two palms with grapes, he handed them to the beggar. The beggar took the grapes and again praised God.
When the Imam (peace be upon him) heard this, he turned to his slave and inquired: How much money do you have with you? The slave replied: Twenty dirhams. The Imam (peace be upon him) handed them over to the beggar. The beggar once again praised God, saying: O’ Lord! Praise is for You, this money is from You and You do not have any partner.
For the third time, the Imam (peace be upon him) asked him to wait and this time, removing his garment, handed it to him. The beggar took the garment and, wearing it, said: Praise be to the God, who has dressed and covered me. Then, addressing the Imam (peace be upon him), he said: O’ Aba A’bdillah! May God grant you a goodly recompense!
Having prayed for him (peace be upon him) the beggar began to move away; however, this time the Imam (peace be upon him) did not stop him.
We figured that had the person not prayed for the Imam (peace be upon him) and had continued to only praise God, the Imam (peace be upon him) would have continued to bestow him with gifts.( Baa Mardum In Guneh Barkhord Koneem, pg. 123; Bihaar al-Anwaar, vol. 47, pg. 42. )