This short post presents the background and halachic details surrounding Shalom Aleichem, according to the Shulchan Aruch Harav — the body of Jewish law compiled by Rabbi Shneur Zalman of Liadi (the Alter Rebbe), the founder and first Rebbe of the Chabad Hasidic movement. While the following entry focuses on the bottom line legal ruling, other customs, opinions, and additional information can be found in the footnotes of the original article, shared by Rabbi Yaakov Goldstein on his online halachic database, shulchanaruchharav.com. Due to its use of Hebrew and halachic terminology, this article is geared towards those with some background in traditional Jewish learning.