Yechezkel 47:1

Orthodox Jewish Bible

47 Afterward he [the angelic being] brought me again unto the Petach HaBeis [HaMikdash]; and, hinei, mayim issued out from under the threshold of the Beis [HaMikdash] eastward; for the forefront of the Beis [HaMikdash] stood toward the east, and the mayim came down from under from the right side of the Beis [HaMikdash], at the south side of the Mizbe’ach.