Reference for Sanhedrin 55:2

וכ"ש אבות להדדי

[cannot testify] for the sons [of eachother], and vice versa; and all the more, 'fathers' [cannot testify] in respectof each other.<span class="x" onmousemove="('comment',' As the exclusion of 'sons' is due only to the kinship of their fathers. ');">²</span>

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