Talmud zu Jechezkiel 44:26

Rav said, when he has left, he counts his nezirut in purity⁸⁴The person who vowed in the cemetery to be a nazir and who will be impure for the next 7 days does nevertheless count his valid days of nezirut from the moment he leaves the cemetery.. If he entered again on his seventh day, he brings a sacrifice of impurity for that day; Rebbi Eliezer said, not for that day⁸⁵If he entered the cemetery again on the day he regained his purity, he is considered a nazir who became impure on the first day of his nezirut, obligated for a sacrifice according to the rabbis but not R. Eliezer.. Cahana asked before Rav: Does he not need the sprinkling of the third and seventh⁸⁶The purification rite prescribed in Num. 19: Being sprinkled with water containing some of the ashes of the Red Cow on the 3^rd and 7^th day, and immersing himself on the 7^th. He becomes pure only after immersion.? He answered him, the Torah called “pure” the one who leaves the grave: “After his purity, seven days shall be counted for him.⁸⁷Ez. 44:26; one would have expected: “Seven days shall be counted until his purity.” Even though this is a verse by a prophet and therefore without legal standing, it can be applied to show usage.” Samuel said, after he left, sprinkled, and repeated, immersed himself, and entered again on that day, he brings a sacrifice of impurity for that day; Rebbi Eliezer said, not for that day⁸⁸Samuel disagrees with Rav; the rules of purity start only on day seven, after the completion of the purification. In the Babli, 19a, Rav agrees with Samuel..