Abdur Rahman bin Abi Mulaika narrated: A man came to Sayyiduna Ibn Abbas (may Allah be pleased with them), so he asked: Where have you come from? He replied: I have drunk the water of Zamzam. He (Ibn Abbas) said: Did you drink it in the manner it should be drunk? He replied: How should it be drunk? He said: When you intend to drink the water of Zamzam, face the Qiblah, then say Bismillah, then drink it in three breaths, then fill yourself with it, because the Messenger of Allah (peace and blessings be upon him) said: "The difference between us and the hypocrites is that they do not fill themselves with the water of Zamzam (they do not drink much of it)."
Hadith Referenceمسند اسحاق بن راهويه / كتاب المناسك / 351
Hadith Takhrij«سنن ابن ماجه ، كتاب المناسك ، باب الشرب من زمزم ، رقم : 3061 . سنن كبريٰ بيهقي : 147/5 . ضعيف الجامع الصغير : 22»