Reference for Niddah 96:22

ר"ש אומר

women examine them. And a woman may be relied upon when by her evidence the law is restricted but not when it is relaxed thereby. How so? [She may be relied upon when she states: 'The girl] is of age', so that the latter should thereby be denied the right of <i>mi'un</i>, or 'She is a minor', so that she should thereby be denied the right of performing <i>halizah</i>; but she is not trusted when asserting, 'She is a minor', so that she should have the right of exercising <i>mi'un</i>, or 'She is of age', so that she should be entitled to perform <i>halizah</i>.

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