Reference for Bekhorot 60:20

בין כך ובין כך מקבלין אותו והוא למד כדרכו והולך:

Our Rabbis taught: If one applies to become a haber, if we saw him practising these privately at his house,<span class="x" onmousemove="('comment',' Prior to agreeing to observe them publicly so that he cannot be accused of doing so merely for show.');">⁸</span>

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