The Basics of Judaism: G-d & Torah: Pronouncing G-d's Name:
Are we permitted to pronounce G-d's Name?
The Name Y-H-V-H was pronounced as it is written only by the priests in the Temple; we are not permitted to pronounce it that way. See Talmud Pesachim 50a; Sotah 37b-38a; Sanhedrin 90b.
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