And they waited for me as for the rain - That is, as the dry and thirsty earth waits for the rain. This is a continuation of the beautiful image commenced in the previous verse, and conveys the idea that his counsel was as necessary in the assemblies of people as the rain was to give growth to the seed, and beauty to the landscape.
And they opened their mouth wide - Expressive of earnest desire; compare Psalm 119:131 : "I opened my mouth and panted."
As for the latter rain - The early and the latter rains are frequently spoken of in the Scriptures, and in Palestine and the adjacent regions are both necessary to the harvest. The early, or autumnal rains, commence in the latter half of October, or the beginning of November, not suddenly, but by degrees, so as to give the husbandman an opportunity to sow his wheat and barley. The rains come mostly from the west, or southwest, continuing for two or three days at a time, and failing especially during the nights. During the months of November and December, they continue to fall heavily; afterward they return only at longer intervals, and are less heavy; but at no period during the winter do they entirely cease to occur. Rain continues to fall more or less during the month of March, but it is rare after that period. The latter rains denote those which fall in the month of March, and which are so necessary in order to bring forward the harvest, which ripens early in May or June. If those rains fail, the harvest materially suffers, and hence, the expressions in the Scriptures, that "the husbandman waits for that rain;" compare James 5:7; Proverbs 16:15. The expression, "the early and the latter rain" seems, unless some material change has occurred in Palestine, not to imply that no rain fell in the interval, but that those rains were usually more copious, or were especially necessary, first for sowing, and then for bringing forward the harvest. In the interval between the "latter" and the "early" rains - between March and October - rain never falls, and the sky is usually serene; see Robinson's Bibl. Researches, vol. ii. pp. 96-100. The meaning here is, that they who were assembled in counsel, earnestly desired Job to speak, as the farmer desires the rain that will bring forward his crop.

They waited for me as for the rain - The idea continued. They longed as much to hear me speak, to receive my counsel and my decisions, as the thirsty land does for refreshing waters.
They opened their mouth wide - A metaphor taken from ground chapped with long drought.
The latter rain - The rain that falls a little before harvest, in order to fill and perfect the grain. The former rain is that which falls about seed-time, or in spring, in order to impregnate and swell the seed, and moisten the earth to produce its nourishment.

And they waited for me as for the rain; and they opened their mouth wide (p) [as] for the latter rain.
(p) As the dry ground thirsts for the rain.

And they waited for me as for the rain,.... The former rain, as appears by the following clause, which fell in autumn, about October, after seedtime, in order to nourish and cherish it, and bring it up; now as the husbandman waited for this, was in daily expectation of it, and greatly desired it, and longed for it; see James 5:7; so the people waited for Job, for his coming into their public assemblies, whether civil or religious, and longed to hear him speak, for their counsel and instruction, for their comfort and direction in all things they stood in need of:
and they opened their mouth wide as for the latter rain; which fell in the spring about March, in the time of harvest, which was of use to fatten the kernals of grain, and make them fuller, and the flour finer; now Job's hearers opened their mouths, as the dry and parched earth gapes for rain; or the husbandman, or the gardener, as the Targum, opens his mouth, and asks and prays for rain; or as a hungry and thirsty man opens his mouth to take in refreshment, or expresses thereby his desire of it; or as persons somewhat deaf open their mouths to hear the better, there being a way through the mouth to the internal ear, as anatomists (h) observe; which lies through the Eustachian tube, out of the palate, to the internal cavity of the ear, called the "concha"; wherefore such persons naturally open their mouths when they would hear attentively; all which expresses the eager desire of Job's hearers after his doctrine, which, like the rain, would be useful, profitable, and edifying to them; their view was not to indulge their curiosity, to please their ears, but to affect their hearts, and instruct their minds.
(h) Scheuchzer, ut supra. (Physic. Sacr. l. vol. 4. p. 759.)

Image of Job 29:22 continued. They waited for my salutary counsel, as the dry soil does for the refreshing rain.
opened . . . mouth--panted for; Oriental image (Psalm 119:131). The "early rain" is in autumn and onwards, while the seed is being sown. The "latter rain" is in March, and brings forward the harvest, which ripens in May or June. Between the early and latter rains, some rain falls, but not in such quantities as those rains. Between March and October no rain falls (Deuteronomy 11:14; James 5:7).