Мишна́ к Келим 1:17

Within it was the Soreg, ten handbreadths high. There were thirteen breaches in it, which had been originally made by the kings of Greece, and when they repaired them they enacted that thirteen prostrations should be made facing them. Within this was the Hel, which was ten cubits [broad]. There were twelve steps there. The height of each step was half a cubit and its tread was half a cubit. All the steps in the Temple were half a cubit high with a tread of half a cubit, except those of the Porch. All the doorways in the Temple were twenty cubits high and ten cubits broad except those of the Porch. All the doorways there had doors in them except those of the Porch. All the gates there had lintels except that of Taddi which had two stones inclined to one another. All the original gates were changed for gates of gold except the gates of Nicanor, because a miracle happened with them. Some say: because their copper gleamed like gold.

If rain came down upon a person, even if he was unclean with a father of impurity, it does not come under the law of ‘if water be put’; But if he shook it off, it does come under the law of ‘if water be put’. If one stood under a rain-pipe to cool himself or to wash himself, [the water falling on him] is unclean if he is unclean; If he is clean, it [only] comes under the law of if water be put.

If a pot full of water was placed in a mikveh, and a person who was unclean by a father of impurity put his hand into the pot, it becomes unclean. But if [he was unclean] by a "touch of defilement," the pot remains clean. But any of the other liquids [contained in the pot] becomes unclean, for water cannot purify the other liquids.