[go] without saying

used to say that something is so obvious that there is no need for further explanation

The idiom "go without saying" is believed to have originated in the English language in the early 20th century. It is used to express the idea that something is so evident or universally acknowledged that it doesn't require explicit mention or elaboration.

And it went without saying that nobody in his building would miss him.
It goes without saying they won't get paid a penny for their efforts.
It should go without saying that safety is a top priority in any workplace.
In a healthy relationship, trust and communication should go without saying.
As a general rule, being polite and respectful to others should go without saying.