Leviticus 26:4

then will I give you the rains for your lands in your seasons, the early and the late, and the land shall yield the fruits of increase, and the tree on the face of the field shall be prosperous in its fruit.

The vav in I will provide is like the vav in “the earth was formless and empty” [Genesis 1:2]. A verb with a vav that is accented on the ultima is always in the future tense; if it is accented on the penultimate it is in the past tense, with very few exceptions.

its produce from “the mountains bring him food” [Job 40:20]. It is not known whether the yod is part of the triliteral root, or whether, like the word “living creature” [cf . Genesis 7:4], it is not part of the triliteral root.

THEN WILL I GIVE YOUR RAINS IN THEIR SEASON. He mentioned the matter of rains first [of all the blessings] because if they come in their proper season, the air is pure and good and the springs and rivers are good [clear], and thus it [the rain] is a [prime] cause of physical health, and all produce will increase and be blessed by it, just as He said, and the Land shall yield her produce, and the trees of the field shall yield their fruit. Thus because of this [pure state of the environment] people do not become sick, and none shall miscarry, nor be barren, even among their cattle, and they will live out [the full extent of] their days. For when the material frame [of human beings] is large and healthy, they can continue [in health] as in the days of Adam., on Verse 4, (Vol. I pp. 98-99). Thus this [blessing — the rains in their seasons] is the greatest of all blessings [and therefore it is given first place].
Now He said that the heavens will respond to the earth with rains in their seasons, and the earth shall respond, Verse 24. with its “produce”, which includes vegetation and all moving creatures — cattle, beasts, creeping things and fowl, as well as fish — for the term ha’aretz [“the earth” or “the land,” in and ‘the land’ shall yield her produce] includes the whole of the lower sphere [i.e., everything under the sphere of the moon], just as [in the verses]: In the beginning G-d created the heaven and ‘ha’aretz’ (the earth);, Verse 3 (Vol. I, p. 25) where he discusses this topic fully, and mentions also the verses cited in the following text. And the heaven and ‘ha’aretz’ (the earth) were finished;, 2:1. and similarly, Praise the Eternal from ‘ha’aretz’ (the earth), ye sea-monsters and all deeps, and so also in most verses in Scripture [where this word occurs]. Thus all things created in the lower spheres are “the produce of the earth.”