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The 1901 Jewish Encyclopedia
A frequent exclamation and expression of thanks. The first part of the formula is derived by Levy and Kohut from "yashar" = "to be firm or healthy." The phrase occurs in the Talmud in the Hebrew form "yishar koḥeka" (Shab. 87a) and in the Aramaic form "yishar ḥeylak" (Shab. 53a, 62b; Lam. R. 52b; Gen. R. 54), and is now used, for example, as a response to the preacher after the sermon, to the ḥazzan after the prayer, and to the priest after the priestly blessing, while it serves as a formula of thanks also.
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Singer, Isidore, Ph.D, Projector and Managing Editor. Entry for 'Yishar Koḥeka'. 1901 The Jewish Encyclopedia. https://www.studylight.org/encyclopedias/eng/tje/y/yishar-koeka.html. 1901.
the Sixth Week after Easter