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Tekufot (Hebrew: תקופות, singular: tekufah, literally, "turn" or "cycle") are the four seasons of the year recognized by Talmud writers. According to Samuel Yarḥinai, each tekufah marks the beginning of a period of 91 days 7½ hours. The four tekufot are:
An ancient superstition is connected with the tekufot. All water that may be in the house or stored away in vessels in the first hour of the tekufah is thrown away in the belief that the water is then poisoned, and if drunk would cause swelling of the body, sickness, and sometimes death. Several reasons are advanced for this. Some say it is because the angels who protect the water change guard at the tekufah and leave it unwatched for a short time. Others say that Cancer fights with Libra and drops blood into the water. Another authority accounts for the drops of blood in the water at Tekufat Nisan by pointing out that the waters in Egypt turned to blood at that particular moment. At Tekufat Tammuz, Moses smote the rock and caused drops of blood to flow from it. At Tekufat Tishrei the knife which Abraham held to slay Isaac dropped blood. At Tekufat Tevet, Jephthah sacrificed his daughter (Abudarham, Sha'ar ha-Tekufot, p. 122a, Venice, 1566).
The origin of the superstition cannot be traced. Hai Gaon, in the 10th century, in reply to a question as to the prevalence of this custom in the "West" (i.e., west of Babylon), said it was followed only in order that the new season might be begun with a supply of fresh, sweet water. Ibn Ezra ridicules the fear that the tekufah water will cause swelling, and ascribes the belief to the "gossip of old women" (ib.). Hezekiah da Silva, however, warns his co-religionists to pay no attention to ibn Ezra's remarks, asserting that in his own times many persons who drank water when the tekufah occurred fell ill and died in consequence. Da Silva says the principal danger lies in the first tekufah (Nisan), and a special announcement of its occurrence was made by the beadle of the congregation (Peri Ḥadash, on Oraḥ Ḥayyim, 428, end). The danger lurks only in unused water, not in water that has been boiled or used in salting or pickling. The danger in unused water may be avoided by putting in it a piece of iron or an iron vessel (Bet Yosef on the Tur, and Isserles' note to Shulḥan Aruk, Oraḥ Ḥayyim, 455, 1; Be'er Hetev, to Yore De'a, 116, 5). R. Jacob Mölln required that a new iron nail should be lowered by means of a string into the water used for baking matsot during Tekufat Nisan (Sefer Maharil, p. 6b, ed. Warsaw).