Nedarim9: 3
רַבִּי מֵאִיר אוֹמֵר, יֵשׁ דְּבָרִים שֶׁהֵן כְּנוֹלָד וְאֵינָן כְּנוֹלָד; וְאֵין חֲכָמִים מוֹדִים לוֹ. כֵּיצַד? אָמַר: ,,קוֹנָם שֶׁאֵינִי נוֹשֵׂא אֶת פְּלוֹנִית, שֶׁאָבִיהָ רָע”, אָמְרוּ לוֹ: ,,מֵת”, אוֹ שֶׁעָשָׂה תְשׁוּבָה; ,,קוֹנָם לְבַיִת זֶה שֶׁאֵינִי נִכְנָס, שֶׁהַכֶּלֶב רַע בְּתוֹכוֹ”, אוֹ ,,שֶׁהַנָּחָשׁ בְּתוֹכוֹ”, אָמְרוּ לוֹ: ,,מֵת הַכֶּלֶב”, אוֹ שֶׁנֶּהֱרַג הַנָּחָשׁ, הֲרֵי הֵן כְנוֹלָד וְאֵינָן כְּנוֹלָד. וְאֵין חֲכָמִים מוֹדִים לוֹ.
R' Meir says: There are things which are like unexpected developments, and are not like unexpected developments; the Sages, however, do not agree with him. How? [If one] said: “Konam, my marrying So-and-so, because her father is evil,” [and] they told him: “He died,” or that he had repented; “Konam, this house, with respect to my entering because an evil dog is in it” or “because a snake is in it,” [and] they told him: “The dog died,” or that the snake had been killed —- these are things which are like unexpected developments, but are not like unexpected developments. The Sages, however, do not agree with him.