Reference for Yoma 147:4
שאני התם דאמר קרא (ויקרא ה, א) אם לא יגיד והאי לאו בר הגדה הוא כלל
Now a dice-player, as far as Biblical law is concerned, is qualified to bear witness and only the Rabbis declared him unfit, and yet an oath does not apply to him?<span class="x" onmousemove="('comment',' By Biblical law one is considered a robber only if one actually robs from one's hand, as in II Sam. XXIII, 21 where the technical term 'gazal', rob, is used: He (plucked - lit.,'robbed') the spear out of his hand; v. also B.K. 79b. So that, if the oath does not apply to a gambler, although by Biblical law, he is not prevented from testifying, the proposed distinction is unjustified.');"><sup>7</sup></span> There it is different, for Scripture said: If he do not utter it,<span class="x" onmousemove="('comment',' Lev. V, 1.');"><sup>8</sup></span>