Mishna, Baba Batra 2:1

One may not dig a cistern close to the cistern of another, nor a trench, nor a vault, nor a water channel, nor a washer-man's pool, unless it is three tefahim distant from the wall of the other, and he must plaster it with lime. One must place olive peat, dung, salt, lime and rocks three tefahim away from the wall of one's neighbor, and he must plaster it with lime. Seeds, the plough and urine must be three tefahim away from the wall. One must also place a mill a distance of three from the bottom millstone, which is four from the top millstone; and an oven three from its base, which is four from its rim. [Moreshet translation]