Book of Hosea Chapter 6 Vs. 3

 Israel and Judah Are Unrepentant

Then shall we know, if we follow on to know the LORD: his going forth is prepared as the morning; and he shall come unto us as the rain, as the latter and former rain unto the earth. Hos. 6:3

Then shall we... Then (after the three days of national mourning and repentance, and after being raised up to live in His sight) we will know (continue to know), if we follow on to know (if we walk in the light, Hos. 6:2).

his going forth... This refers to the definite preparation and time of the second coming of Christ in the plan of God. His coming is fixed as surely as the morning is eternally fixed to come at a certain time daily (Gen. 1:14-19; 8:22). His coming to save and bless Israel will be like refreshing rains after a long dry season—even as the latter and former rain upon the earth.

He shall come... God will no longer deal with Israel like a moth and rottenness (5:12). Instead, He will deal with them like life-giving and refreshing rain.

and former rain... The former rain fell in October at the seed time; the latter or spring rain fell in March and April to cause the grain to mature and ripen. One came at the beginning and the other at the end (or harvest time) of good things; so in the spiritual realm, God would come down upon Israel to make a complete harvest of the nation (Zec. 10:1; Zec. 12:10-13:1; Rom. 1:25-29). The former and the latter rain are speaking of a time when the Spirit of God falls on the people of the earth like rain.

Acts 2:17 "And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams:"

Jas. 5:7 "Be patient therefore, brethren, unto the coming of the Lord. Behold, the husbandman waiteth for the precious fruit of the earth, and hath long patience for it, until he receive the early and latter rain."

Col. 1:28 "Whom we preach, warning every man, and teaching every man in all wisdom; that we may present every man perfect in Christ Jesus:”

Col.1:9 " For this cause we also, since the day we heard [it], do not cease to pray for you, and to desire that ye might be filled with the knowledge of his will in all wisdom and spiritual understanding;"

Joel 2:23 "Be glad then, ye children of Zion, and rejoice in the LORD your God: for he hath given you the former rain moderately, and he will cause to come down for you the rain, the former rain, and the latter rain in the first [month]."

This is a call to the study of God and His Word. The way to know the LORD is to diligently study His Word.

Let us know, let us follow up to know, Jehovah:

As soon as we seek Him, we shall find Him

And He shall come to us like the winter-rain,

Like the spring-rain, pouring on the land!

The Lord will surely respond favorably to such loyalty. His emergence from His hiding place (cf. Hos. 5:6, 5:15) will be as certain as the sunrise. He will pour out His blessings on His people, as the winter and spring rains… water the earth and assure agricultural prosperity. The latter comparison was especially well chosen since the regularity of these rains was a sign of the Lord’s favor (cf. Deut. 11:13-15).