Why do we need to light Shabbat candles?

Lighting Shabbat candles is a rabbinic obligation (chiyuv m'divrei sofrim) rooted in the principle of oneg Shabbat (Shabbat delight) and shalom bayit (domestic peace). The Rambam rules it as a full chova (obligation) — not merely an optional practice — because having light in the home is essential to the honor and joy of Shabbat. Both men and women are equally obligated.

Key Takeaways

Shabbat candle lighting is a rabbinic obligation, not a Biblical commandment, yet it carries the status of a full chova (obligation).
Its primary purpose is oneg Shabbat (Shabbat delight) — light enables one to eat, walk, and enjoy Shabbat with dignity.
A second reason given is shalom bayit (peace in the home) — darkness causes tension and stumbling; light brings harmony.
Even someone with no food to eat is obligated to beg at doorways for oil to light the candles, demonstrating the seriousness of this obligation.
A blessing is recited before (or in some traditions, after) lighting, using the formula for rabbinic commandments: "asher kid'shanu b'mitzvotav v'tzivanu..."

The Nature of the Obligation

Rabbinic, Yet Obligatory

The Rambam (Maimonides) makes a sharp distinction in his Mishneh Torah:

"הדלקת נר בשבת אינה רשות... ולא מצוה... אלא זה חובה" "Lighting a candle on Shabbat is not optional... nor merely a mitzvah [one need not pursue]... but rather this is an obligation (chova)." [Mishneh Torah, Hilchot Shabbat 5:1]

This places Shabbat candle lighting in a higher category than optional rabbinic practices like eruv chatzerot or netilat yadayim (ritual hand-washing before meals), which the Rambam lists as examples of less-obligatory mitzvot.

The Two Core Reasons

1. Oneg Shabbat — Delight of Shabbat

The Rambam explicitly connects Shabbat candles to oneg Shabbat:

"אפילו אין לו מה יאכל שואל על הפתחים ולוקח שמן ומדליק את הנר שזה בכלל עונג שבת" "Even if he has nothing to eat, he should beg at doorways, take oil, and light the candle — for this is part of the oneg (delight) of Shabbat." [Mishneh Torah, Hilchot Shabbat 5:1]

Without light, a family would sit in darkness, unable to see their food or move safely — hardly a festive, joyous Shabbat.

2. Shalom Bayit — Peace in the Home

The Talmud (Shabbat 25b) gives a second foundational reason: one who has no light in the home on Shabbat has no shalom (peace), because stumbling in the dark causes distress and conflict. The Sages understood that a lit, warm home is the foundation of Shabbat harmony.

The Biblical Connection

While the lighting itself is rabbinic, it connects to the Biblical commandment of Zachor et yom haShabbat l'kad'sho — "Remember the Sabbath day to sanctify it" [Exodus 20:8]. The Rabbis understood "sanctifying" Shabbat to include making it distinguished and honorable, which requires light and joy in the home.

The Blessing and Its Source

Because candle lighting is rabbinic, one might ask: how can we say "v'tzivanu" — "Who has commanded us" — for a rabbinic law? The Rambam addresses this directly:

"היכן צוונו בתורה — שכתוב בה 'אשר יאמרו לך תעשה'" "Where did [God] command us in the Torah? As it is written: 'Whatever they tell you, you shall do'" [Deuteronomy 17:11] [Mishneh Torah, Hilchot Brachot 11:3]

The Torah itself commands us to obey rabbinic rulings — so by following the Sages, we are fulfilling a Biblical instruction to obey them.

The blessing text, as found in the Sephardic liturgy, is:

"בָּרוּךְ אַתָּה יְהֹוָה, אֱלֹהֵינוּ מֶלֶךְ הָעוֹלָם, אֲשֶׁר קִדְּשָׁנוּ בְּמִצְוֹתָיו, וְצִוָּנוּ לְהַדְלִיק נֵר שֶׁל שַׁבָּת" "Blessed are You, Lord our God, King of the Universe, Who has sanctified us with His commandments and commanded us to light the Shabbat candle." [Siddur Edot HaMizrach, Shabbat Candle Lighting]

A Deeper Dimension

The post-candle-lighting prayer in the Sephardic tradition [Siddur Edot HaMizrach] invokes the verse "כִּי נֵר מִצְוָה וְתוֹרָה אוֹר" — "For a mitzvah is a candle and Torah is light" [Proverbs 6:23]. This suggests that Shabbat candles carry a symbolic dimension: they represent the or (light) of Torah and mitzvot illuminating our homes and our lives.

For personal guidance on specific questions regarding candle lighting times, how many candles to light, or other practical details, consult your local rabbi or posek.