On Friday night we welcome the angels by singing Shalom Aleichem the question is why do we tell them:
צֵאתְכֶם לְשָׁלוֹם מַלְאֲכֵי הַשָּׁלוֹם מַלְאָכֵי עֶלְיוֹן
Essentially sending them away that seems to be a quite ungracious host so why do we do it?