Jewish Publication Society of America Version (JPS1917) - Isaiah 30:15 >

For thus said the Lord GOD, the Holy One of Israel: in sitting still and rest shall ye be saved, in quietness and in confidence shall be your strength; and ye would not.

King James Version (KJV) - Isaiah 30:15 >

For thus saith the Lord GOD, the Holy One of Israel; In returning and rest shall ye be saved; in quietness and in confidence shall be your strength: and ye would not.

Berean Study Bible (BSB) - Isaiah 30:15 >

For the Lord GOD, the Holy One of Israel, has said: “By repentance and rest you would be saved; your strength would lie in quiet confidence— but you were not willing.”