Reference for Shabbat 69:9
אמר רבה בר בר חנה א"ר יוחנן הלכה כר' יהודה לענין שבת והלכה כר' יוסי לענין תרומה בשלמא הלכה כר' יהודה לענין שבת לחומרא אבל לענין תרומה מאי היא אילימא לטבילה ספקא היא
According to whom? Shall we say, according to R. Judah [himself]? but it is doubtful!<span class="x" onmousemove="('comment',' Whether it is day or night. It may be night already, in which case the tebillah is not followed by sunset. ');"><sup>16</sup></span> But if it means twilight, as defined by R. Judah, according to R. Jose; [why state] priests may perform tebillah then-it is obvious!<span class="x" onmousemove="('comment',' R. Judah's twilight period is certainly earlier than that of R. Jose which is but the twinkling of an eye. ');"><sup>17</sup></span> — I might think that twilight, as defined by R. Jose, is a continuation of R. Judah's; [therefore] we are told that R. Judah's twilight ends and then R. Jose's commences. Rabbah b. Bar Hanah said in R. Johanan's name: The <i>halachah</i> is as R. Judah in respect to the Sabbath, and the <i>halachah</i> is as R. Jose in respect to <i>terumah</i>. Now, as for the <i>halachah</i> being as R. Judah in respect to the Sabbath, it is well: this is in the direction of stringency.<span class="x" onmousemove="('comment',' All those things which are forbidden Friday at twilight are forbidden at the earlier time stated by R. Judah. ');"><sup>18</sup></span> But in respect of <i>terumah</i>, what is it? Shall we say, for tebillah?<span class="x" onmousemove="('comment',' That priests may perform tebillah during twilight as defined by R. Judah, because the halachah is as R. Jose that it is still day then. ');"><sup>19</sup></span> it is doubtful!<span class="x" onmousemove="('comment',' Since he rules that the halachah is as R. Judah in respect to the Sabbath, he must regard R. Judah's view as possibly correct. ');"><sup>20</sup></span>