Reference for Parah 7:3

הַמְקַדֵּשׁ בְּאַחַת יָדוֹ וְעוֹשֶׂה מְלָאכָה בְאַחַת יָדוֹ, אִם לוֹ, פָּסוּל. וְאִם לְאַחֵר, כָּשֵׁר. הַמְקַדֵּשׁ לוֹ וּלְאַחֵר, שֶׁלּוֹ פָּסוּל, וְשֶׁל אַחֵר כָּשֵׁר. הַמְקַדֵּשׁ לִשְׁנַיִם כְּאֶחָד, שְׁנֵיהֶן כְּשֵׁרִין:

One who sanctifies [the water] with one hand and does work with one hand, if [the work is] for himself, it is invalid; and if it is for another, it is valid. One who sanctifies for himself and for another, his is invalid and the other's is valid. One who sanctifies for two [others] at once, both are valid.

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