Sulam on Zohar, Yitro
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וישמע יתרו כהן מדין וגו': ר' חזקיה פתח ואמר, וישא אהרן את ידו. כתוב ידו חסר יוד, שהמשמעות יד אחד. והוא משום שצריך להרים הימין על השמאל. וכבר ביארנו הסוד.
The Sefaria Sulam, 2023
And Jethro, priest of Midian, heard… Rabbi Jezekiah began and said, “And Aaron lifted up his hand.” It is written “hand” without the letter Yud, which means a single hand. And this is because it is necessary to lift the right hand over the left. And we have already explained the secret.