קְדֹשִׁ֤ים יִהְיוּ֙ לֵאלֹ֣הֵיהֶ֔ם וְלֹ֣א יְחַלְּל֔וּ שֵׁ֖ם אֱלֹהֵיהֶ֑ם כִּי֩ אֶת־אִשֵּׁ֨י יְהוָ֜ה לֶ֧חֶם אֱלֹהֵיהֶ֛ם הֵ֥ם מַקְרִיבִ֖ם וְהָ֥יוּ קֹֽדֶשׁ׃
They shall be holy unto their God, and not profane the name of their God; for the offerings of the LORD made by fire, the bread of their God, they do offer; therefore they shall be holy.
Zohar
"than one who pranks himself" is as we said, that he puts on airs, curls his hair, and acts haughtily, "but lacks bread." This means a lack of faith, as it is written, "to offer the bread of his Elohim" (Vayikra 21:17), and "the bread of their Elohim they do offer" (Ibid. 6). Bread is the Shechinah in both verses. Faith is the Shechinah, so lacking bread means lacking faith.