examination of skin disease mandated by 9, and the Mishnah taught that a priest could examine anyone else's symptoms, but not his own. And Rabbi Meir taught that the priest could not examine his relatives. The Mishnah taught that anyone could inspect skin disease, but only a priest could declare it unclean or clean. The Mishnah taught that the priests delayed examining a bridegroom — as well as his house and his garment — until after his seven days of rejoicing, and delayed examining anyone until after a holy day. Rabbi Joshua ben Levi taught that required "two living clean birds" to be brought to purify the person afflicted with skin disease because the afflicted person did the work of a babbler in spreading evil tales, and therefore required that the afflicted person offer babbling birds as a sacrifice.</ref> The Gemara interpreted the expression "two living birds" in The Gemara interpreted the word "living" to mean those whose principal limbs are living (excluding birds that are missing a limb) and to exclude treifah birds (birds with an injury or defect that would prevent them from living out a year). The Gemara interpreted the word "birds" (, zipparim) to mean kosher birds. The Gemara deduced from the words of "Every bird (, zippor) that is clean you may eat," that some zipparim are forbidden as unclean — namely, birds slaughtered pursuant to The Gemara interpreted the words of "And these are they of which you shall not eat," to refer to birds slaughtered pursuant to And the Gemara taught that repeats the commandment so as to teach that one who consumes a bird slaughtered pursuant to infringes both a positive and a negative commandment. Rabbi Isaac taught that God told Noah that just as a pair of birds (ken) cleansed a person with skin disease (as instructed in ), so Noah's Ark would cleanse Noah (so that he would be worthy to be saved from the Flood). Rabbi Hanina ben Gamaliel interpreted the words "completely blue (, techelet)" in to teach that blue dye used to test the dye is unfit for further use to dye the blue, techelet strand of a tzitzit, interpreting the word "completely" to mean "full strength." But Rabbi Johanan ben Dahabai taught that even the second dyeing using the same dye is valid, reading the words "and scarlet" (, ushni tolalat) in to mean "a second