Possessive case with the apostrophe before s omitted

[Barman]

1) He must needs do this.

In the above sentence, whether 'needs' is used as the possessive case of 'need' with the apostrophe before s omitted? Does it (needs) mean the following:

needs = need's = of necessity = necessarily

 

[teechar]

1) He must needs do this.

Where did you find that sentence? Provide a link please.
It's ungrammatical and vague.

In the above sentence, [STRIKE]does[/STRIKE] is 'needs' [STRIKE]is[/STRIKE] used as the possessive case of 'need' with the apostrophe before s omitted? Does it (needs) mean the following?

No way. Note my corrections. I strongly advise you to focus on cementing your understanding of basic English grammar by practising writing short, realistic and straightforward sentences with a clear context and meaning.

 

[GoesStation]

He must needs do it is archaic but not ungrammatical. "Must needs" is an old variation of "must". You'll see it in modern contexts where writers are trying to reproduce old-fashioned English.

There is no possessive meaning and an apostrophe is not possible.

 

[emsr2d2]

Did you Google "definition of must needs" before asking here? If you had, you would have found multiple explanations. Here's one.

 

[GoesStation]

Did you Google "definition of must needs" before asking here? If you had, you would have found multiple explanations. Here's one.

Joseph Smith was apparently quite fond of the expression, to say no more.

 

[SoothingDave]

"Needs must when the devil drives" is found in Shakespeare. And I suggest leaving that expression there.