וְשָׂמַחְתָּ֖ בְּחַגֶּ֑ךָ אַתָּ֨ה וּבִנְךָ֤ וּבִתֶּ֙ךָ֙ וְעַבְדְּךָ֣ וַאֲמָתֶ֔ךָ וְהַלֵּוִ֗י וְהַגֵּ֛ר וְהַיָּת֥וֹם וְהָאַלְמָנָ֖ה אֲשֶׁ֥ר בִּשְׁעָרֶֽיךָ׃
And thou shalt rejoice in thy feast, thou, and thy son, and thy daughter, and thy man-servant, and thy maid-servant, and the Levite, and the stranger, and the fatherless, and the widow, that are within thy gates.
Tosefta Sukkah
Those out on a religious mission are exempt from [the mitzvah of living in] the sukkah, however it is said: "It is no praise for a man to leave his house during the festival." There is a story of Rabbi Ilai, that he went to visit Rabbi Elieser in Lud. He said to him, What does this mean, Ilai? Are you not one of those who rest on the festival? Is it not said, It is no praise for man to leave his house during the festival since it is said, And thou shalt rejoice, thou and thy house?