Musannaf Ibn Abi Shayba 15:438

Abu Bakr narrated to us, he said: Ubayd Allah ibn Musa narrated to us, from Uthman ibn al-Aswad, from Muhammad ibn Abd al-Rahman ibn Abi Bakr, he said: A man sat with Ibn Abbas and said to him: "From where did you come?" He said: "I drank from the water of Zamzam." He said: "Did you drink from it as it should be drunk?" He said: "When you drink from it, face the Kaaba, mention the name of Allah, and breathe three times."