'Oil' in the Bible

He said to me, “What do you see?” I said, “I see, and behold, a lampstand all of gold, with its bowl [for oil] on the top of it and its seven lamps on it with seven spouts belonging to each of the lamps which are on the top of it.

And there are two olive trees by it, one on the right side of the bowl and the other on its left side [supplying it continuously with oil].”

Then he said to me, “This [continuous supply of oil] is the word of the Lord to Zerubbabel [prince of Judah], saying, ‘Not by might, nor by power, but by My Spirit [of whom the oil is a symbol],’ says the Lord of hosts.

And I answered again, and said unto him, What be these two olive branches which through the two golden pipes empty the golden oil out of themselves?

And he saith, 'These are the two sons of the oil, who are standing by the Lord of the whole earth.'