New International Version
Awake, awake, arm of the LORD, clothe yourself with strength! Awake, as in days gone by, as in generations of old. Was it not you who cut Rahab to pieces, who pierced that monster through?

American Standard Version
Awake, awake, put on strength, O arm of Jehovah; awake, as in the days of old, the generations of ancient times. Is it not thou that didst cut Rahab in pieces, that didst pierce the monster?

Berean Study Bible
Awake, awake, put on strength, O arm of the LORD. Wake up as in days past, as in generations of old. Was it not You who cut Rahab to pieces, who pierced through the dragon?

Douay-Rheims Bible
Arise, arise, put on strength, O thou arm of the Lord, arise as in the days of old, in the ancient generations. Hast not thou struck the proud one, and wounded the dragon?

English Revised Version
Awake, awake, put on strength, O arm of the LORD; awake, as in the days of old, the generations of ancient times. Art thou not it that cut Rahab in pieces, that pierced the dragon?

King James Bible
Awake, awake, put on strength, O arm of the LORD; awake, as in the ancient days, in the generations of old. Art thou not it that hath cut Rahab, and wounded the dragon?

World English Bible
Awake, awake, put on strength, arm of Yahweh; awake, as in the days of old, the generations of ancient times. Isn't it you who cut Rahab in pieces, who pierced the monster?

Young's Literal Translation
Awake, awake, put on strength, O arm of Jehovah, Awake, as in days of old, generations of the ages, Art not Thou it that is hewing down Rahab, Piercing a dragon!

Isaiah 51:9 Additional Translations ...