Reference for Parah 7:4

קַדֵּשׁ לִי וַאֲקַדֵּשׁ לָךְ, הָרִאשׁוֹן כָּשֵׁר. מַלֵּא לִי וַאֲמַלֵּא לָךְ, הָאַחֲרוֹן כָּשֵׁר. קַדֵּשׁ לִי וַאֲמַלֵּא לָךְ, שְׁנֵיהֶם כְּשֵׁרִים. מַלֵּא לִי וַאֲקַדֵּשׁ לָךְ, שְׁנֵיהֶם פְּסוּלִים:

[One who says to his fellow,] "Sanctify for me and I will sanctify for you," the first [one sanctified] is valid. "Fill for me and I will fill for you," the latter [one filled] is valid. Sanctify for me and I will fill for you," both are valid. "Fill for me and I will sanctify for you," both are invalid.

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