'Source' in the Bible

Then one of the [twenty-four] elders said to me, “Stop weeping! Look closely, the Lion of the tribe of Judah, the Root of David, has overcome and conquered! He can open the scroll and [break] its seven seals.”

“I, Jesus, have sent My angel to testify to you and to give you assurance of these things for the churches. I am the Root (the Source, the Life) and the Offspring of David, the radiant and bright Morning Star.”