Mainstream biblical scholars and historians agree that the Old Testament does not explicitly teach the doctrine of the Trinity, nor did ancient Jewish communities possess a concept of a triune Godhead.
There is no historical evidence in pre-Christian Jewish literature including the Hebrew text, the Dead Sea Scrolls, or ancient commentaries of a belief in a plurality of divine Persons. While Christian theologians retrospectively interpret certain plural expressions (such as 'Let us make man' in Genesis 1:26) as hints of the Trinity, ancient Judaism strictly maintained a unitarian monotheistic understanding of God.