If ye throughly amend your ways - Literally, If in making good ye fully make good your ways. God will no longer admit of half-hearted work. Semblances of piety cannot deceive him; he will not accept partial reformation; there must be a thorough amendment.

For if.

Jeremiah 7:3 Thus said the LORD of hosts, the God of Israel, Amend your ways and your doings, and I will cause you to dwell in this place.

Jeremiah 4:1,2 If you will return, O Israel, said the LORD, return to me: and if you will put away your abominations out of my sight...

Isaiah 1:19 If you be willing and obedient, you shall eat the good of the land:

if ye throughly.

Judges 5:1 Then sang Deborah and Barak the son of Abinoam on that day, saying,

Judges 21:12 And they found among the inhabitants of Jabeshgilead four hundred young virgins, that had known no man by lying with any male...

1 Kings 6:12,13 Concerning this house which you are in building, if you will walk in my statutes, and execute my judgments...

Isaiah 16:3 Take counsel, execute judgment; make your shadow as the night in the middle of the noonday; hide the outcasts...

Ezekiel 18:8,17 He that has not given forth on usury, neither has taken any increase, that has withdrawn his hand from iniquity...

The Valley of Hinnom.
A great part of the valley of Kedron was called also the 'Valley of Hinnom.' Jeremiah, going forth into the valley of Hinnom, went out by the gate "Hacharsith, the Sun-gate," Jeremiah 19:2; that is, the Rabbins and others being interpreters, 'by the East-gate.' For thence was the beginning of the valley of Hinnom, which, after some space, bending itself westward, ran out along the south side of the city. There is no need to repeat those very many things, which are related of this place in the Old …
John Lightfoot—From the Talmud and Hebraica

First Ministry in Judæa --John's Second Testimony.
(Judæa and Ænon.) ^D John III. 22-36. ^d 22 After these things came Jesus and his disciples into the land of Judæa [That is, he left Jerusalem, the capital of Judæa, and went into the rural districts thereof. We find him there again in John xi. and Luke xiii.-xviii. He gained disciples there, but of them we know but few, such as Mary, Martha, Lazarus, Simeon, and Judas Iscariot]; and there he tarried with them [It is not stated how long he tarried, but it may have been from …
J. W. McGarvey—The Four-Fold Gospel

Jeremiah
Among those who had hoped for a permanent spiritual revival as the result of the reformation under Josiah was Jeremiah, called of God to the prophetic office while still a youth, in the thirteenth year of Josiah's reign. A member of the Levitical priesthood, Jeremiah had been trained from childhood for holy service. In those happy years of preparation he little realized that he had been ordained from birth to be "a prophet unto the nations;" and when the divine call came, he was overwhelmed with …
Ellen Gould White—The Story of Prophets and Kings