In chapter 4 of the Book of Amos, verses 1-3 are talking about people who pervert the truths of the church. They will fall into falsities in outermost things.

In the Bible, fish represent "lower" things than mammals, so we can interpret the fishhooks in verse 2 as meaning being caught and held fast in natural or lower things.

Verses 4-6 are about acts of worship such as tithes and sacrifices. These look similar to genuine worship, but are only external sorts of things. We can tell because ‘teeth’ (in verse 6) represent ultimates or outermost things (see Secrets of Heaven 6380). It follows that “cleanness of teeth” would mean outermost things that look good but only imitate genuine worship. The Lord exhorts, “Yet you have not returned to me.”

Verses 7-8. Some things true will remain, when where there are too many false ideas, the truths don't get through. This can be seen where the Lord says, “I made it rain on one city; I withheld rain from another city... where it did not rain the part withered.” Again the Lord exhorts, “Yet you have not returned to me.”

Verse 9. Afterward all things of the church are falsified, shown by blight attacking the gardens, vineyards, fig tree and olive trees. The last three represent spiritual, natural and celestial things, or all the things of spiritual life. “Yet you have not returned to me,” says the Lord.

Verses 10-11. The Lord explains the devastating things he allowed to happen: plague in Egypt, death of young men by swords, stench in the camps, Sodom and Gomorrah. This is because they are profaned by sensual knowledges. Profanation means the mixing of good and evil together. (See Secrets of Heaven 1001[2]).

This extends to all things of the church, with the church being the Lord’s kingdom on earth (Secrets of Heaven 768[3]).

With profanation “as soon as any idea of what is holy arises, the idea of what is profane joins immediately to it,” (Secrets of Heaven 301).

Now there is hardly anything left. “Yet you have not returned to Me,” says the Lord again.

Verses 12-13: Because people adamantly remain in their profane ways, they are warned, “Prepare to meet your God!”. This is the God powerful and mighty, “who forms mountains, and creates the wind,” and even more close to home, “Who declares to man what his thought is.” As intimately a knowing as that is, the Lord’s love for all humanity is contained in His exhortations for them to turn themselves to Him.

See, for example, Luke 6:44-45, and True Christian Religion 373.

494. And if anyone wants to harm them, fire will proceed from their mouth and devour their enemies. (11:5) This symbolically means that anyone who wishes to destroy these two essential elements perishes from a hellish love.

To want to harm the two witnesses means, symbolically, to wish to destroy the two essential elements of the New Church, namely, an acknowledgment of the Lord as being God of heaven and earth even as to His humanity, and a life in accordance with the Ten Commandments. To be shown that these are the two witnesses, see no. 490 above.

Fire's proceeding from their mouth means, symbolically, that hellish love will do so; and its devouring their enemies means, symbolically, that those who harm them will perish because of it. Here, however, it is not to be supposed that fire will issue from the mouth of the witnesses, but that it will do so from people who wish to destroy these two essential elements of the New Church, meant by the two witnesses (no. 490). The fire is the fire of hell; for people who do not live according to the Ten Commandments, and who do not turn to God, their Savior and Redeemer, cannot help but be caught up in a hellish love and perish.

[2] The case is the same as elsewhere in the Word where we are told that Jehovah sends fire that consumes the wicked, or that Jehovah does other things like that out of the fire of His wrath, anger, or fury, which mean not that they come from Jehovah, but that they do so from the hellish love of the wicked.

We read of instances like that in the Word because that is how they appear, and the Word in its literal sense was composed in terms of appearances and things that correspond.

Since we are told that fire proceeded from their mouth, and this means that it originated from people caught up in a hellish love, we will cite some passages where fire is said to issue from Jehovah:

The breath of Jehovah, like a stream of brimstone, will consume it. (Isaiah 30:33)

Smoke went up from His nostrils, and fire from His mouth...; coals were kindled by it. (Psalms 18:8)

(I will) pour out on them... the wrath of My anger; for all the earth shall be devoured in the fire of My zeal. (Zephaniah 3:8)

...behold, Jehovah will come with fire... for retribution in the wrath of His anger, and His rebuke in flames of fire. (Isaiah 66:15)

You will be visited by Jehovah... with the flame of devouring fire. (Isaiah 29:6, cf. 30:30)

And so on in many places elsewhere.