טָ֭עֲמָה כִּי־ט֣וֹב סַחְרָ֑הּ לֹֽא־יִכְבֶּ֖ה בליל [בַלַּ֣יְלָה] נֵרָֽהּ׃
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Rashi
her lamp does not go out at night It is written בליל, with the “hey” missing; on the night of watching (ליל שמורים), when the Egyptians were plagued, it shone for Israel and protected them.