''... for if this plan or this undertaken is of men, it will fail; but if it is of God, you will not be able to overthrow them...''
Them in Gamaliel's statement above refers to
In the statement above, "them" refers to Peter and the apostles. Gamaliel was a Jewish teacher and a member of the Sanhedrin, who spoke to the council about the apostles' preaching of the gospel. He advised the council to be careful in how they dealt with the apostles because if their teachings were of human origin, they would eventually fail. But if they were from God, then the council would be fighting against God, which would be futile.