Synonyms for "as the saying goes"

When writing where I want to present quotes, I've used the phrase "as the saying goes...". Is there any other phrase that can be used to present a quote or proverb ?

One possibility is one sentence adverb usage of proverbially:

proverbially [adverb]: in a way that relates to a well-known saying or phrase:

• We must be living in those “interesting times” often proverbially mentioned.
• It is proverbially impossible to please everyone.

...

• Proverbially enough, it rained on the plain today.

[Cambridge Dictionary]

The Collins definition of the adjective is highly relevant:

proverbial [adjective]:

You use proverbial to show that you know the way you are describing something is one that is often used or is part of a popular saying.

• The limousine sped off down the road in the proverbial cloud of dust.

......................

Quotes, when directly attributed, are often introduced by the expressions in / to use the words of [the].

• In the words of George Bernard Shaw, “A happy family is but an earlier heaven.”

[Madhubun Educational Books_Facebook]

• To use the words of Albert Einstein. (1879-1955) again: “The intellect has little to do on the road to discovery. There is a leap of consciousness, call it.

[A de Bruin_De Gruyter_Google search]

• 'The private individual who gives his fifty hundreds to a particular Institution,' to use the words of the Hull and Eastern Counties' Herald ...

Henry Woodcock_The Hero of the Humber_Amazon]

• By the end of October the last Turkish regular had quitted Magyar soil, and, to use the words of a contemporary observer, one quarter of Hungary was ....

[YourDictionary]