Amos 8:8-10

Verse 8

Shall not the land tremble for this - It is supposed that an earthquake is here intended, and that the rising up and subsiding as a flood refers to that heaving motion that takes place in an earthquake, and which the prophet here compares to the overflowing and subsiding of the waters of the Nile. But it may refer to commotions among the people.
Verse 9

I will cause the sun to go down at noon - This may either refer to that darkness which often precedes and accompanies earthquakes, or to an eclipse. Abp. Usher has shown that about eleven years after Amos prophesied there were two great eclipses of the sun; one at the feast of tabernacles, and the other some time before the passover. The prophet may refer to the darkness occasioned by those eclipses; yet I rather think the whole may refer to the earthquake.
Verse 10

I will turn your feasts into mourning - See on Amo 8:3 (note).

A bitter day - A time of grievous calamity.
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