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Is it correct to use commas around therefore in the following quote?

An important prerequisite to meet the requirements of ... is, therefore, the ability to ...

Or should I omit the first comma to make the sentence correct?

An important prerequisite to meet the requirements of ... is therefore, the ability to ...

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You can either not use commas at all

is therefore the ability to...

Or use commas before and after:

is, therefore, the ability to...

The commas are parenthetical, which can often be omitted when the interruption is brief, as in this example, but you should never use a comma before a parenthetical phrase and not after it (or vice versa).

See the section on parenthetical commas here to learn more.

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