'Source' in the Bible

“Its rocks are the source of sapphires,And its dust contains gold.

The baptism of John was from what source, from heaven or from men?” And they began reasoning among themselves, saying, “If we say, ‘From heaven,’ He will say to us, ‘Then why did you not believe him?’

And having been made perfect, He became to all those who obey Him the source of eternal salvation,

What is the source of quarrels and conflicts among you? Is not the source your pleasures that wage war in your members?