Is it bad to withdraw a manuscript one day after it has been submitted? I submitted it yesterday, after sending it to a repository. Then, a colleague gave a quick read and found some narrative issues, i.e., our abstract seems to be claiming something we did not do and we did not give much importance for some classical results in our introduction. He pointed out that any reviewer who knows those classical results will raise a red flag when reading our paper. So, I want to withdraw it, if possible, change the text and re-submit it to the same journal. How bad it is to do that?
Just another question:

How bad it is to simply e-mail the editor asking for a chance of re-submission due to some issues with the paper itself?

It is a mathematics journal and the status is currently &quot;with editor&quot;.
Thanks in advance!
I am a co-editor of an interdisciplinary journal (social sciences/humanities). I would rather an author withdraw and get the piece into shape than for us to either read it and have to desk reject, or to send to reviewers and they flag it. It's mildly embarrassing but like so many things in academia (and life), you will care more than they will care – it is trivial for me to return a paper to an author.
If the editorial management system allows you to withdraw the paper, even better.