Verse 1
Send a ram Moab, in distress, sends a gift to Judah along with a request for asylum. Referring to Judah as the “ruler of the land” acknowledges the Moabites’ past status as subjects of Israel. See 2 Kgs 3:4–8.
from Sela -- Either Moab is regarded as having taken refuge in Edom, and is therefore bidden to send her tribute from the Edomite capital, Sela (equivalent to “Petra”), or “Sela,” here is not a proper name, but a collective used to designate the rocky parts of Moab, to which she had betaken herself (as in Jer. 48:28).
the mountain of daughter Zion Jerusalem. See note on Isa 1:8.