Esias 30:15

15 Thus saith the Lord, the Holy Lord of Israel; When thou shalt turn and mourn, then thou shalt be saved; and thou shalt know where thou wast, when thou didst trust in vanities: your strength became vain, yet ye would not hearken:

Esias 30:15 In-Context

13 therefore shall this sin be to you as a wall suddenly falling when a strong city has been taken, of which the fall is very near at hand.
14 And the fall thereof shall be as the breaking of an earthen vessel, small fragments of a pitcher, so that thou shouldest not find among them a sherd, with which thou mightest take up fire, and with which thou shouldest draw a little water.
15 Thus saith the Lord, the Holy Lord of Israel; When thou shalt turn and mourn, then thou shalt be saved; and thou shalt know where thou wast, when thou didst trust in vanities: your strength became vain, yet ye would not hearken:
16 but ye said, We will flee upon horses; therefore shall ye flee: and, We will be aided by swift riders; therefore shall they that pursue you be swift.
17 A thousand shall flee because of the voice of one, and many shall flee on account of the voice of five; until ye be left as a signal-post upon a mountain, and as one bearing an ensign upon a hill.

The Brenton translation of the Septuagint is in the public domain.