Reference for Menachot 73:3

רב אשי אמר מידכה כתיב בה"י כהה א"ל ר' אבא לרב אשי ואימא ידך שבכח א"ל מי כתיב בחי"ת

R'Ashi said, He derives it from thy hand,<span class="x" onmousemove="('comment',' Ex. XIII, 16. , with superfluous 'he', is interpreted as , the weaker hand. vfsh jf sh');">⁵</span> which, being written with the letter he at the end, indicates the weaker hand. Thereupon R'Abba said to R'Ashi, perhaps it means, the stronger hand?<span class="x" onmousemove="('comment',' Interpreting as , for the letters he and heth are frequently interchanged since they resemble each other so closely in form and pronunciation.');">⁶</span> - He replied, Is it written with the letter heth?

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