Reference for Rosh Hashanah 62:8
ואידך פלוגתא דרב פפא ורב נחמן בר יצחק רב פפא אמר כרם רבעי רב נחמן בר יצחק אמר לשון של זהורית
must set aside a quarter<span class="x" onmousemove="('comment',' It is not certain whether this means a quarter of a shekel (== half a denar) or a quarter of a denar. V. Tosaf. s.v. .');"><sup>17</sup></span> for a nest of pigeons'.<span class="x" onmousemove="('comment',' While the Temple stood a new convert had to bring a sacrifice (v. Ker. 9a) , a couple of pigeons being the smallest, and after the destruction of the Temple the Rabbis still insisted on his bringing them in case the Temple should be rebuilt.');"><sup>18</sup></span> Said R'Simeon B'Eleazar: Rabban Johanan took a vote on it and annulled this rule, because it may lead to wrongdoing.<span class="x" onmousemove="('comment',' Because the money set aside might be used for secular purposes.');"><sup>19</sup></span>