Muwatta Imam Malik (Riwayat Yahya)

Abdullah bin Arqam said to Hazrat Aslam Adawi, "Show me a camel for riding, I will ask Sayyiduna Umar (may Allah be pleased with him) to give it to me for my ride." I said, "Alright, there is a camel from charity." Abdullah bin Arqam said, "Would you like that a fat man, on a hot day, washes his private parts and thighs and gives you that water, and you drink it?" Aslam says that I became angry and said, "May Allah forgive you, you say such a thing to me." Abdullah bin Arqam said, "Charity is also the filth of people and their washings."