Reference for Zevachim 230:16

אלא קשיא עולה תרי תנאי היא דתניא ר' ישמעאל אומר כללות נאמרו בסיני ופרטות באהל מועד

And thus it was said by Solomon, [There is.] a time to keep silence, and a time to speak:<span class="x" onmousemove="('comment',' Ecc. III, 7.');"><sup>22</sup></span> sometimes a man is silent and is rewarded for his silence; at others a man speaks and is rewarded for his speaking.