Reference for Rosh Hashanah 36:13

א"ר יוסף שאני חנוכה דאיכא מצוה א"ל אביי ותיבטיל איהי ותיבטל מצותה

but these [mentioned in Megillath Ta'anith] remain unaffected. R'Kahana cited the following in objection: 'On one occasion a fast was decreed in Lydda on Hanukah<span class="x" onmousemove="('comment',' One of the Festivals mentioned in Megillath Ta'anith.');">¹⁸</span> and R'Eliezer went down there and bathed and R'Joshua had his hair cut,<span class="x" onmousemove="('comment',' R. Eliezer and R. Joshua were disciples of R Johanan b. Zaccai, and became authorities only after the destruction of the Temple. Bathing and haircutting were prohibited on fast days.');">¹⁹</span>

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