Reference for Niddah 6:10

כֹּל הַטָּעוּן בְּרָכָה לְאַחֲרָיו, טָעוּן בְּרָכָה לְפָנָיו. וְיֵשׁ טָעוּן בְּרָכָה לְפָנָיו וְאֵין טָעוּן בְּרָכָה לְאַחֲרָיו:

Any [action] that requires a blessing after it requires a blessing before it. But there may be one that requires a blessing before it but does not require a blessing after it.

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