I say, and may Allah grant success: It is disliked to rinse the mouth and inhale water through the left hand; for Aisha, may Allah be pleased with her, said: "The hand of the Messenger of Allah, peace be upon him, was the right hand for his purification and food, and his left hand was for his needs and anything that was impure," in Sunan Abu Dawood 1/55, and in Sha'b al-Iman 5/77, and in the Sunan al-Kubra by al-Bayhaqi 1/113. See: Tabyin al-Haqaiq 1: 7, and al-Hadiyyah al-Alaiyyah p. 26, and Allah knows best.