Reference for Niddah 130:8

רשב"ג אומר משום ר' יוסי

reversed, seeing that we are here dealing with the laws of cleanness? — Rather say: As these provisions were applied to matters of cleanness so were they applied to yen nesek.) And how long is an 'onah? R. Hiyya b. Abba citing R. Johanan replied: Either a day or a night. R. Hana She'una or, as some say, R. Hana b. She'una citing Rabbah b. Bar Hana who had it from R. Johanan replied: Half a day and half a night. And in connection with this R. Samuel b. R. Isaac explained: There is no real difference between them,<span class="x" onmousemove="('comment',' R. Hiyya and Rabbah b. Bar Hana. ');">⁷</span>

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