Reference for Rosh Hashanah 4:12

וממאי דמעשה דאב קדים דילמא מעשה דשבט קדים

Perhaps it is from the setting up of the Tabernacle?<span class="x" onmousemove="('comment',' Which was in Nisan of the second year of the exodus.');">¹⁶</span> - [We may reply to this] on the model of R'Papa, who said [in another connection]<span class="x" onmousemove="('comment',' V. infra 3b.');">¹⁷</span> that the occurrence of the expression 'twentieth year' in two contexts provides us with a gezerah shawah:<span class="x" onmousemove="('comment',' V. Glos.');">¹⁸</span>

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