Hadith.4245 - One of his companions asked him about drinking water in a single breath.
Imam عليه السلام said: "If the person handing you the water is your servant, then drink it in three breaths; but if he is free, then drink it in a single breath."
This narration is found in the reports of Muhammad ibn Yaqub al-Kulayni (may Allah سبحانه وتعالى have mercy on him).