Reference for Bekhorot 110:4
והא כתיב
- Said R'Nahman B'Isaac, (others say: R'Aha B'Jacob) : [It means thus]: It is the Euphrates [mentioned] first.<span class="x" onmousemove="('comment',' I.e., the river which went forth from Eden, and from thence was parted and became four heads (Gen. II, 10) . The explanation is based on the superfluous 'it is'.');"><sup>3</sup></span>
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