Joel 2:18,19

Then was Jehovah jealous for his land, and had pity on his people. And Jehovah answered and said, &c. The future tenses of the A.V. are grammatically indefensible [42]. Though it is not expressly so stated, it is understood that the prophet's exhortations had the intended effect; the people shewed themselves to be truly penitent; the priests interceded on their behalf; and the words quoted describe Jehovah's gracious change of purpose, and the promises which He in consequence vouchsafed to His people.

[42] See the grounds for this statement in the writer's Hebrew Tenses, § 82 Obs.

jealous for his land Zechariah 1:14; Zechariah 8:2. Jehovah is "jealous," when His power is doubted, or the honour which is His due is given to another (see Exodus 20:5; Deuteronomy 4:24; Deuteronomy 32:21; Isaiah 42:8; Zephaniah 3:8, noticing in each case the context): this happens, however, when His people or His land suffer, and the heathen argue in consequence that He is unable to relieve them; accordingly the feeling of "jealousy" prompts Him then to interpose on their behalf (Ezekiel 36:5-6; cf. Isaiah 9:7; Isaiah 37:32 [where zealis a very inadequate rendering]).