Isaac brought Rebecca into the tent of his mother Sarah
Although Abraham lit the Shabbat candles after Sarah’s passing (for he observed all the Torah’s commandments), his candles did not remain lit throughout the week, as Sarah’s had. But when Rebecca began kindling
the Shabbat lights, her candles continued to burn miraculously the whole week.
This demonstrates the unique ability of Jewish women and girls—who are
all “daughters” of Sarah and Rebecca—to influence the spiritual character
of the home, illuminating it with the holiness of the Shabbat throughout the ensuing mundane week. Although the illumination provided by their candles might be physically visible for only a limited time, their spiritual illumination continues throughout the entire week.
—from Daily Wisdom #1