So I looked this up, or tried to do so. I could not find the source for that quote.

The closest I could find is this - not exactly an objective or authoritative source but we'll roll with it.

https://www.lgbtqnation.com/2024/06/donald-trump-shares-stag...

Is there more to the quote, or was he simply referring to a verse from Leviticus while illustrating the distinction between that verse and a later verse? If the latter then that's obviously not at all the same thing as 'promoting the stoning of gay people'.