Machshirin 3:4-5

Machshirin 3:4

Let’s say that one sprinkled his house, after which he brought in wheat, which got damp. If it got damp from the water, ki yutan applies; if from the stone floor, ki yutan doesn’t apply. Let’s say that one washed his clothes in a trough and then put wheat in it, which became wet. If because of the water, ki yutan applies; if because of the trough itself, ki yutan doesn’t apply. If one put it in the sand to dampen, ki yutan applies. The people of Machoz used to dampen their produce in the sand and the Sages told them that if that’s what they always do, then they’ve never prepared food in a state of ritual purity.

Machshirin 3:5

If one dampens his produce in dry clay, Rabbi Shimon says that ki yutan applies if there was dripping liquid on it; if otherwise, then not. If one sprinkles his threshing floor, he need not be concerned about wheat that he might throw there getting damp. If a person plucks grass with dew on it to dampen wheat, ki yutan doesn’t apply (because he planned to use the grass, not the dew). If he planned to use the dew, then ki yutan applies. If one takes wheat to grind and rain fell on it, ki yutan applies if this pleased him. Rabbi Yehuda says that it’s impossible for a person not to be pleased by this. Rather, ki yutan applies if he stopped (so that more rain can fall on it).