In the 30th saying in the Gospel of Thomas, Jesus deals with the topic of the Trinity. At least it seems like he is referring to the Trinity. He may be talking about tritheism or even polytheism. He is certainly talking about duality and nonduality.
See also the episode entitled “Trinity and Nonduality.” at this link:
View Marshall's books here:
https://www.amazon.com/stores/Marshall-Davis/author/B001K8Y0RU