What is the Biblical basis for the "one" in "the Trinitarian God is one being in three persons"?

In the Trinity, the one divine being is three persons whereas one human being is only one person (source: [Is The Trinity a philosophical contradiction?](https://carm.org/trinity-philosophical-contradiction-question)) . >A "being" is an independently existing thing. The Father, Son and Holy Spirit are not three "beings". For instance, Adam is a human being, Eve is a human being and Seth is a human being. You have three human beings because you have three independently existing things. But the persons of the Trinity are not independently existing things, so we cannot say that there are three divine beings. But rather the Trinity is one being existing as three divine persons. The point is that they are not three separate things in the way Adam and Eve are three separate beings precisely *because* they cannot exist apart from each other. The three do not exist independently. They cannot exist apart from each other. They are one being (literally, one independent thing) and thus, they are one God. **What is the Biblical basis that Trinity is "one being in three persons"?** Did the Scripture say that the Father, Son and Holy Spirit are not three separate beings? Usually, the Trinity is defined as of one substance, nature, essence and being. This question specifically asked what exactly does "one being" mean in regards to the Trinity because *being* is different from *nature* and *person.* 'To be' means to exist. 'Being' means existing.