One who immersed himself in a river and then there was in front of him another river and he crossed it, the second [water] purifies the first [water]. If his fellow pushed him in during exercise or his beast [pushed him in], the second [water] purifies the first [water]. But if [he did it] out of playfulness, it comes under the law of ‘if water be put’.

One who swam in water, the water that splashed out does not come under the law of ‘if water be put’; But if it was his intention to splash his friend, this comes under the law of ‘if water be put’. If one made a ‘bird’ in the water, neither [the water] that splashed out nor what remained in it comes under the law of ‘if water be put’.

Produce onto which a leak [from a roof] fell and he mixed it up in order that it might become dry [quickly]: Rabbi Shimon says: it comes under the law of ‘if water be put’. But the sages say: it does not come under the law of ‘if water be put’.

One who measures a cistern whether for its depth of for its breadth, it comes under the law of ‘if water be put' the words of Rabbi Tarfon. But Rabbi Akiva says: if [it was measured] for its depth, it comes under the law of ‘if water be put’; but if for its breadth, it does not come under the law of ‘if water be put’.

If one put his hand or his foot or a reed into a cistern in order to check whether it had any water, it does not come under the law of ‘if water be put’; But if to ascertain how much water it had, it comes under the law of ‘if water be put’. If one threw a stone into a cistern to check whether it had any water, [the water] that was splashed up does not come under the law of ‘if water be put’, and also [the water] that is on the stone is clean.

One beats upon a hide: If outside the water, it comes under the law of ‘if water be put’; Inside the water, it does not come under the law of ‘if water be put’. Rabbi Yose says: even inside the water it comes under the law of ‘if water be put’, because his intention was that the water should come off together with the filth.

The water that comes up into a ship or into the bilge or on the oars does not come under the law of ‘if water be put’. The water that comes up in snares, nets, or in fishing nets does not come under the law of ‘if water be put’; But if he shook them out it does come under the law of ‘if water be put’. One who leads a ship out into the Great Sea in order to forge its bolts, or one who takes a nail out into the rain in order to forge it, or one who puts a brand out in the rain in order to extinguish it, this comes under the law of ‘if water be put’.

[Water on] the covering of tables or on the matting of bricks does not come under the law of ‘if water be put’; But if they were shaken, it does come under the law of ‘if water be put’.

A flow pouring [from one vessel to another] is clean, except [the flow] of honey of ziphim bees and honey batter. Bet Shammai say: also [the flow of] thick pottage of split beans, because it thickens up backwards.

One who pours hot water into hot water, or cold water into cold water, or hot water [poured] into cold water remains clean; But from cold water into hot water, the [cold water] becomes unclean. Rabbi Shimon says: even in the case of hot water poured into hot water it becomes unclean if the strength of the heat of the lower [water] is greater than that of the upper [water].

If a woman whose hands were clean stirred an unclean pot and her hands perspired, they become unclean. If her hands were unclean and she stirred a clean pot and her hands perspired the pot becomes unclean. Rabbi Yose says: only if her hands dripped. One who weighs grapes with a balance, the wine in the scale is clean until it is poured into a vessel. Behold, this is like baskets of olives and grapes when they are dripping [with sap].