Use in the synagogue Aleinu is recited with all the congregants standing. One reason for this is because it is a declaration of faith that should be done with great fear and awe, but also that the first and last letters of the prayer spell עד—"witness"—and it is appropriate for the praying person as a witness of god to stand when testifying.Nulman, Macy, Encyclopedia of Jewish Prayer (1993, NJ, Jason Aronson) p. 25.
use in the synagogue aleinu is recited with all the congregants standing one reason for this is because it is a declaration of faith that should be done with great fear and awe but also that the first and last letters of the prayer spell עד—"witness"—and it is appropriate for the praying person as a witness of god to stand when testifyingnulman macy encyclopedia of jewish prayer (1993 nj jason aronson) p 25