וְנֶחְשַׁ֥ב לָכֶ֖ם תְּרוּמַתְכֶ֑ם כַּדָּגָן֙ מִן־הַגֹּ֔רֶן וְכַֽמְלֵאָ֖ה מִן־הַיָּֽקֶב׃
And the gift which ye set apart shall be reckoned unto you, as though it were the corn of the threshing-floor, and as the fulness of the wine-press.
Read kabbalistic (mystical) interpretation of Numbers 18:27: and classical mystical sources.