GOD'S WORD® Translation
If only you had listened to my commands! Your peace would be like a river [that never runs dry]. Your righteousness would be like waves on the sea.

American Standard Version
Oh that thou hadst hearkened to my commandments! then had thy peace been as a river, and thy righteousness as the waves of the sea:

Berean Study Bible
If only you had paid attention to My commandments, your peace would have been like a river, and your righteousness like waves of the sea.

Douay-Rheims Bible
O that thou hadst hearkened to my commandments: thy peace had been as a river, and thy justice as the waves of the sea,

English Revised Version
Oh that thou hadst hearkened to my commandments! then had thy peace been as a river, and thy righteousness as the waves of the sea:

King James Bible
O that thou hadst hearkened to my commandments! then had thy peace been as a river, and thy righteousness as the waves of the sea:

World English Bible
Oh that you had listened to my commandments! then your peace would have been like a river, and your righteousness like the waves of the sea:

Young's Literal Translation
O that thou hadst attended to My commands, Then as a river is thy peace, And thy righteousness as billows of the sea,

Isaiah 48:18 Additional Translations ...