Reference for Sanhedrin 137:5

והא תנא דבי ר' ישמעאל בן ולא אב

— He replied: <font>Such a minor can produce semen</font>, but cannot beget therewith; <font>for it is like the seed of cereals less than a third grown</font>.<span class="x" onmousemove="('comment',' Such cereals contain seed, which if sown, however, will not grow. ');">⁴</span>

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