Yesaya 13:2

13:2 ¹ On a bare hill raise a signal flag,

shout to them,

wave your hand,

so they might enter the gates of the princes!

Yesaya 18:3

18:3 All you who live in the world,

who reside on the earth,

you will see a signal flag raised on the mountains;

you will hear a trumpet being blown.

[13:2]  ¹ sn The Lord is speaking here (see v. 3).