'Sap' in the Bible

[Growing in grace] they will still thrive and bear fruit and prosper in old age;They will flourish and be vital and fresh [rich in trust and love and contentment];

The trees of the Lord drink their fill,The cedars of Lebanon which He has planted,

But if some of the branches were broken off, and you [Gentiles], being like a wild olive shoot, were grafted in among them to share with them the rich root of the olive tree,