American Standard Version
Therefore, behold, I will cause them to know, this once will I cause them to know my hand and my might; and they shall know that my name is Jehovah.

Berean Study Bible
“Therefore behold, I will inform them, and this time I will make them know My power and My might; then they will know that My name is the LORD.

Douay-Rheims Bible
Therefore, behold I will this once cause them to know, I will shew them my hand and my power: and they shall know that my name is the Lord.

English Revised Version
Therefore, behold, I will cause them to know, this once will I cause them to know mine hand and my might; and they shall know that my name is Jehovah.

King James Bible
Therefore, behold, I will this once cause them to know, I will cause them to know mine hand and my might; and they shall know that my name is The LORD.

World English Bible
Therefore, behold, I will cause them to know, this once will I cause them to know my hand and my might; and they shall know that my name is Yahweh.

Young's Literal Translation
Therefore, lo, I am causing them to know at this time, I cause them to know My hand and My might, And they have known that My name is Jehovah!

Jeremiah 16:21 Additional Translations ...