President Donald Trump and First Lady Melania Trump wished Jews a “Happy Hanukkah” on Sunday, just before families and communities gathered to light the first candle of the eight-night holiday.

This week, Jews around the world will celebrate the miracles of Hanukkah. @FLOTUS Melania and I send our very best wishes for a blessed and Happy Hanukkah! https://t.co/LrnGcc86w4 pic.twitter.com/Kdjeyvkzmb — Donald J. Trump (@realDonaldTrump) December 2, 2018

Hannukah (alternatively spelled “Chanukah,” a transliteration of the Hebrew “חָנֻכָּה”) celebrates the re-dedication of the Holy Temple in Jerusalem in the 2nd century B.C., after the Jews, led by the Maccabees, defeated the occupying army of the Seleucid Greeks and cleansed the sanctuary of pagan worship. Jewish tradition holds that when the Jews searched the Temple for oil to light the menorah, a sacred candelabra, they only found enough to last one day, but it lasted for eight.

Jews observe the holiday by lighting candles (or oil lamps) on a special menorah — also called a “Chanukiah” — each night, adding a new light in ascending in order each night until the eighth night, when every light is ablaze.

The holiday is associated with various other traditions as well. Many Jews eat delicacies fried in olive oil, including potato pancakes (“latkes”) or special jelly doughnuts (“sufganiot”). Children gamble for low stakes with special four-sided tops called “dreidels,” with each side marked with a Hebrew letter standing for the words in the phrase, “A great miracle happened there.” (In Israel, the phrase reads slightly differently: “A great miracle happened here.”)

Friends and relatives often exchange gifts — typically “gelt,” small amounts of money or chocolate coins. (In the U.S., people tend to give larger gifts for Hanukkah, owing largely to the influence of the Christmas holiday.)

Many Jews believe that it is essential to publicize the miracle of Hanukkah, and so many communities hold public menorah lightings. Doing so is seen partly as a symbol of communal survival in the face of centuries of persecution.

In his greeting, President Trump made special mention of the recent mass shooting at a synagogue in Pittsburgh:

Unfortunately, Jews today continue to face many different forms of violence, hatred, and bigotry around the globe. We remember all those from the Tree of Life—Or L’Simcha Congregation—whose lives were tragically taken in Pittsburgh, Pennsylvania, this past October. As one Nation, we pledge our continued love and support for the victims, their families, and the community, and we pray that the victims’ families find some measure of peace and comfort during this holiday season.

The president and first lady will welcome guests to the White House for a Hanukkah party on Tuesday, Dec. 11.

Joel B. Pollak is Senior Editor-at-Large at Breitbart News. He is a winner of the 2018 Robert Novak Journalism Alumni Fellowship. He is also the co-author of How Trump Won: The Inside Story of a Revolution, which is available from Regnery. Follow him on Twitter at @joelpollak.