Reference for Zevachim 196:1

דם חטאת למטה ודם עולה למעלה טעון כיבוס

that if blood of a sin-offering is below and blood of a burnt-offering is above,<span class="x" onmousemove="('comment',' First blood of a sin-offering fell on a garment and then blood of a burntoffering fell upon it. - Only the former necessitates the washing of the garment.');">¹</span> it requires washing.<span class="x" onmousemove="('comment',' Since the blood of a sin-offering fell actually on the garment and soaked into it.');">²</span>

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