Reference for Chullin 257:8

אמר רבא

it conveyed the graver uncleanness!<span class="x" onmousemove="('comment',' The morsel when joined to the limb was regarded as a primary source of uncleanness to convey the graver uncleanness, and it is established that whatsoever will convey the graver uncleanness later on does not require to be rendered susceptible to uncleanness by water, v. supra 121a; how much more so this morsel which in the past did convey the graver uncleanness!');">⁵</span>

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