Midrash for Sanhedrin 130:5

אלא אמר רבא שאני עדים זוממין הואיל וישנן בראיה

R. Johanan ruled that he is liable to punishment, &nbsp; &nbsp; because the movement of his lips is an action; Resh Lakish ruled that he is not, because this is not an action?<span class="x" onmousemove="('comment',' Hence we see that R. Johanan considers voice an action? ');">⁵</span>

Sifrei Devarim