וְהָיָ֕ה בַּאֲכָלְכֶ֖ם מִלֶּ֣חֶם הָאָ֑רֶץ תָּרִ֥ימוּ תְרוּמָ֖ה לַיהוָֽה׃
then it shall be, that, when ye eat of the bread of the land, ye shall set apart a portion for a gift unto the LORD.
Read kabbalistic (mystical) interpretation of Numbers 15:19: and classical mystical sources.