Isaiah 17:1 is a prophetic oracle concerning Damascus, stating that it will be destroyed and become a ruinous heap, along with the cities of Aroer. This prophecy, likely given in the early reign of King Ahaz of Judah, foretells Damascus's desolation and the scattering of its people.
Here's a more detailed breakdown:

"An oracle concerning Damascus":
This verse introduces a prophetic message focused on the city of Damascus, the capital of Aram (Syria).

"Behold, Damascus will cease from being a city":
This highlights the complete destruction of Damascus, emphasizing that it will no longer function as a populated urban center.

"and it will be a ruinous heap":
The verse describes the city's state after its destruction, likening it to a pile of rubble.

"The cities of Aroer will be deserted":
In addition to Damascus, the prophecy also includes the cities of Aroer, which are predicted to be abandoned and left to the grazing of animals.
Historical Context:

This prophecy is believed to have been given around the time that Damascus was allied with Israel (Samaria) against Judah, during the reign of King Ahaz of Judah.

Fulfillment:
Historical records indicate that Tiglath-Pileser III of Assyria conquered Damascus in 732 BC, fulfilling the prophecy to some degree. However, some scholars believe the prophecy has a broader, more complete fulfillment yet to come.