Abu Dawud Book 35, Hadith Number 4731.
Narated By AbuBarzah : AbdusSalam ibn AbuHazim AbuTalut said: I saw AbuBarzah who came to visit Ubaydullah ibn Ziyad. Then a man named Muslim who was there in the company mentioned it to me.
When Ubaydullah saw him, he said: This Muhammad of yours is a dwarf and fat. The old man (i.e. AbuBarzah) understood it.
So he said: I did not think that I should remain among people who would make me feel ashamed of the company of Muhammad (PBUH).
Thereupon Ubaydullah said: The company of Muhammad (PBUH) is a honour for you, not a disgrace. He added: I called for you to ask about the reservoir. Did you hear the Apostle of Allah (PBUH) mentioning anything about it? AbuBarzah said: Yes, not once, twice, thrice, four times or five times. If anyone believes it, may Allah not supply him with water from it. He then went away angrily.