Here is the related material:
https://answeringislamblog.wordpress.com/2022/06/28/davids-multi-personal-lord-pt-2/
https://answeringislamblog.wordpress.com/2022/11/13/appearance-of-the-trinity-to-abraham-and-david/
https://answeringislam.info/authors/shamoun/binity_shema1.html
https://answeringislam.info/authors/shamoun/binity_shema2.html