The concept of Trinity is rooted in the Hebrew Bible.
References
[1] Jewish Encyclopedia -PREEXISTENCE: Kaufmann Kohler, Ludwig Blau
‘The “Spirit of God” which “moved upon the face of the waters” (Gen. i. 2) is the spirit of the Messiah (Gen. R. viii. 1; comp. Pesiḳ. R. 152b, which reads as follows, alluding to Isa. xi. 2.…’
https://www.jewishencyclopedia.com/articles/12339-preexistence
[2] Babylonian Talmud –Sanhedrin 38b
https://www.sefaria.org/Sanhedrin.38b.19?lang=bi
[3] The Bodies of God and the World of Ancient Israel 1st Edition

[4] Benjamin Sommer Comments on the Trinity Doctrine
3.57-6.37