Amos documented another vision he had - the LORD standing by the altar, supervising the work of destruction. His judgment cannot be escaped and LORD stays close to His hard-work.
The threshold of a house is the strongest structure of the house, and shaking it is equivalent to bringing the house down. The LORD will sift the house of Israel, as grain is sifted in a sieve. Many sinners who think they are safe and unaffected by these calamities will have their ends met by the sword.
Later, LORD will repair and restore the tabernacle of David. At that time, those captives of Israel will be restored and rebuild the ruined city. They will have fruits and wine in abundance. Israel will be planted in the land, and no longer pulled up.
Amos 9:15 "I will plant Israel in their own land,
never again to be uprooted
from the land I have given them,”
says the LORD your God.