Early in Hebrew scriptures, there are several passages that suggest, not an outright exclusion of the existence of other gods, but rather an assertion that YHWH is the god of Israelites
Indeed, even what is probably the best-known line, "I am the LORD thy God", doesn't rule out the existence of other gods; all that is commanded is that the Israelites should not worship said other gods.
Indeed, even what is probably the best-known line, "I am the LORD thy God", doesn't rule out the existence of other gods; all that is commanded is that the Israelites should not worship said other gods.