Chullin 95b: Rabbi Shimon ben Elazar said: The first business deal one makes after building a house, having a baby or getting married is an omen of his future success, even though one may not act on this completely as a fortune teller would. Rabbi Elazar said: This is only true of he did three good or three bad deals in a row, thus creating a chazakah.
Rashi: One may not rely on this fortune telling, but still, if he failed in three deals, he should not go out for business too much, because this is an omen that he will be unsuccessful.
חולין צה ע”ב: תניא, רבי שמעון בן אלעזר אומר: בית תינוק ואשה, אף על פי שאין נחש יש סימן. אמר ר׳ אלעזר: והוא דאיתחזק תלתא זימני.
A young man named Yitzchak Ohevzion was interested in buying a certain apartment, but one of the other people living in the building came to him and said, “I would advise you not to buy it, because three deaths have taken place in that apartment. A young baby died, a man was murdered, and a woman died of an illness.”
Yitzchak went to Rabbi Chaim Kanievsky and asked him if he should worry about this. Reb Chaim thought for a moment, and then said, “Go and ask my father-in-law, Rav Elyashiv.” Rav Elyashiv said, “The house is not the cause of those deaths. You can buy the apartment and live in it.” The young man returned to Reb Chaim and told him the answer he had received.
Reb Chaim then said, “The Gemara in Chullin 95b says that we should worry about such things. ‘A house, a child and a wife, although one may not practice fortune telling, there is a sign. Rabbi Elazar said: This is only when there is a chazakah of three times.’ And see Rashi.” But he added, “Now that my father-in-law said you don’t need to worry, you don’t need to worry. “
Source: Divrei Siach, Bemishnasam shel Rabboseinu Rav Yosef Shalom Elyashiv and Rav Chaim Kanievsky, published on Rav Elyashiv’s first yahrtzeit, p. 33.
[Based on this, we can understand the Gemara in Taanis 29b: “A Jew who has a dispute with a non-Jew should avoid going to court in Av, because it has bad mazal; he should try to have it in Adar, which has good mazal.” Seemingly this is “nichush” – fortune telling. But the answer is that if you are not totally rigid about it – you are merely trying to schedule it for Adar, but if necessary you will agree to go to court any time – there is no problem.]
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