C. F. Keil and Franz Delitzsch on Exodus 25:30

Exo 25:30

Bread of the face (פּנים לחם), the mode of preparing and placing which is described in Lev 24:5., was to lie continually before (לפני) Jehovah. These loaves were called “bread of the face” (shew-bread), because they were to lie before the face of Jehovah as a meat-offering presented by the children of Israel (Lev 24:8), not as food for Jehovah, but as a symbol of the spiritual food which Israel was to prepare (Joh 6:27, cf. Joh 4:32, Joh 4:34), a figurative representation of the calling it had received from God; so that bread and wine, which stood upon the table by the side of the loaves, as the fruit of the labour bestowed by Israel upon the soil of its inheritance, were a symbol of its spiritual labour in the kingdom of God, the spiritual vineyard of its Lord.