الكافي- ط الاسلامية, volume 2, page 141

4. A number of our people have narrated from Ahmad ibn Muhammad ibn Khalid from Ya’qub ibn Yazid from Ibrahim ibn Muhammad al-Nawfali in a marfu’ manner from Ali ibn al-Husayn (a.s.) who has said the following: “The Messenger of Allah once passed by a shepherd of camels and asked him for a drink and he said, ‘The milk in their udder is for the morning drink of the people of the village and the milk in the containers is for their evening drink.’ The Messenger of Allah then prayed, ‘O Lord, give him many children and much wealth.’ The Messenger of Allah then passed by a shepherd of sheep and sent his people to ask him for a drink. He milked them and poured it from his milk container altogether in the container for the Messenger of Allah. Along with all the milk he also sent a sheep for him, saying, ‘This is what we have and we can bring you more if you like.’ The Imam said, ‘The Messenger of Allah prayed for him, “O Lord, give him sustenance adequate only for his bare necessities.” A certain man of his companion then asked, ‘O Messenger of Allah, how is it that you prayed for the shepherd who refused to give you any milk in such a way that we all love. However, for the one who readily provided what you asked, you prayed for him with a prayer that we all dislike?’ The Messenger of Allah said, ‘The little thing that is adequate is better than a great deal that diverts one’s mind (from Allah). O Lord, grant to Muhammad and the family of Muhammad only that much which is adequate for them.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.