Commentary for Parah 7:2

הַמְמַלֵּא בְאַחַת יָדוֹ וְעוֹשֶׂה מְלָאכָה בְאַחַת יָדוֹ, הַמְמַלֵּא לוֹ וּלְאַחֵר, אוֹ שֶׁמִּלֵּא לִשְׁנַיִם כְּאַחַת, שְׁנֵיהֶן פְּסוּלִין, שֶׁהַמְּלָאכָה פוֹסֶלֶת בַּמִּלּוּי, בֵּין לוֹ בֵּין לְאַחֵר:

One who fills [a vessel with water] with one hand while doing work with one hand, one who fills for himself and for another, or he fills for two at once, both are invalid, for work invalidates the filling, whether for him or for another.

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