Israel was holiness unto the LORD, and the firstfruits of his increase: all that devour him shall offend; evil shall come upon them, saith the LORD.
Holiness unto the Lord - i:e., was consecrated to the service of Yahweh (Exodus 19:5-6). They thus answered to the motto on their high priest's breastplate, "Holiness to the Lord" (Deuteronomy 7:6; Deuteronomy 14:2; Deuteronomy 14:21). First-fruits of his increase - i:e., of Yahweh's produce: as the first-fruits of the whole produce of the land were devoted to God (Exodus 23:19; Numbers 18:12-13), so Israel was devoted to Him as the first-fruit and representative nation among all nations. So the spiritual Israel (James 1:18; Revelation 14:4.)
All that devour him - carrying on the image of first-fruits, which were eaten Before the Lord by the priests as the Lord's representatives; all who ate (injured) Yahweh's first-fruits - i:e., Israel contracted guilt: e.g., Amalek, the Amorites, etc., extirpated for their guilt toward Israel.
Shall come - rather, came.