Origin

'Live long and prosper' is an abbreviated version of a traditional Jewish religious blessing. It came to a wider public in the Star Trek TV series. It was used there by the character Mr. Spock (actor Leonard Nimoy, himself Jewish) as the greeting of the Vulcan people.

The phrase was the accompanying spoken greeting/blessing to the hand gesture called the Vulcan salute. 'Live long and prosper' is translated, if that is the correct word, from the Vulcan language phrase 'dif-tor heh smusma', which was so uttered in Star Trek: The Motion Picture. The phrase echoes the Hebrew 'Shalom aleichem' and the Arabic 'Salaam alaykum', which roughly translate as 'peace be upon you'.