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והיה לפנות ערב. סָמוּךְ לְהֶעֱרֵב שִׁמְשׁוֹ יִטְבֹּל, שֶׁאֵינוֹ טָהוֹר בְּלֹא הֶעֱרֵב הַשֶּׁמֶשׁ (עי' ספרי): והיה לפנות ערב BUT IT SHALL BE WHEN EVENING COMETH ON, [HE SHALL LAVE HIMSELF WITH WATER] — He should immerse himself close before the setting of the sun, for under no circumstances is he clean without having waited for the sunset (cf. Sifrei Devarim 256:2).