Reference for Moed Katan 28:8

אבל אינו נוהג אבילותו ברגל שנאמר (דברים טז, יד) ושמחת בחגך

Now what about one separated [under a ban]? Should he deport himself as one in 'separation' during a festival? - Said R'Joseph: Come and hear: 'They [the Courts] deal with capital offenses, with [offenses involving judicial] floggings<span class="x" onmousemove="('comment',' Of thirty-nine stripes, for a well-attested breach of a Scriptural prohibition after due warning. V. Deut. XXV, 1-3; Mak., Sonc. ed. p. 90, n. 1.');">⁹</span>

Jastrow