I watched the video now and he quotes the OT throughout. He counters the implicit accusation that his teaching on giving firstfruits is OT by referencing Romans 11:16 without quoting it :
Romans 11:16 For if the firstfruit is holy, the lump is also holy; and if the root is holy, so are the branches.
This is the context :
Romans 11:13*For I speak to you Gentiles; inasmuch as I am an apostle to the Gentiles, I magnify my ministry,*14*if by any means I may provoke to jealousy*those who aremy flesh and save some of them.*15*For if their being cast away*is*the reconciling of the world, what*will*their acceptance*be*but life from the dead?
16*For if the firstfruit*is*holy, the lump*is*also*holy;*and if the root*is*holy, so*are*the branches.*17*And if some of the branches were broken off, and you, being a wild olive tree, were grafted in among them, and with them became a partaker of the root and fatness of the olive tree,*18*do not boast against the branches. But if you do boast,*remember that*you do not support the root, but the root*supports*you.
19*You will say then, “Branches were broken off that I might be grafted in.”*20*Wellsaid.*Because of unbelief they were broken off, and you stand by faith. Do not be haughty, but fear.*21*For if God did not spare the natural branches, He may not spare you either.*22*Therefore consider the goodness and severity of God: on those who fell, severity; but toward you, goodness,[f]*if you continue in*His*goodness. Otherwise you also will be cut off.*23*And they also, if they do not continue in unbelief, will be grafted in, for God is able to graft them in again.*24*For if you were cut out of the olive tree which is wild by nature, and were grafted contrary to nature into a cultivated olive tree, how much more will these, who*are*natural*branches,*be grafted into their own olive tree?
The firstfruit and the root is Jesus, the lump and the branches are believers. There is no discussion on giving.