Reference for Bekhorot 119:21

קרא לתשיעי עשירי ולעשירי תשיעי ולאחד עשר עשירי שלשתן מקודשין

[IF THE NINTH AND THE TENTH CAME OUT AT THE SAME TIME, THE NINTH AND THE TENTH ARE SPOILT.]<span class="x" onmousemove="('comment',' As regards being offered up as tithe, for it is impossible to ascertain which came forth first and is consequently the tithe. Hence since we are in doubt which passed through, first both must pasture and are eaten when blemished.');">¹⁸</span>

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