Joel chapter 2’s appeal to return to the Lord has a timeless quality.
Unusually for prophetic scripture, Joel has left undescribed the specific sins of Judah for which God is calling her to account. We can only guess the “when” and the “what” he feels compelled to address. The prophet could be calling any generation of Israelites to return to behavior suited to a covenant relationship with their God — any generation, that is, that still understands the meaning of fasting and mourning, of grain and drink offerings, of the trumpet blown to call together the solemn assembly.
Israelite worship came with a lot of baggage.