Jack makes this comment in chapter 8 shortly after he quits Ralph's tribe and establishes his own group of savages at the opposite end of the island. After Jack quits Ralph's tribe, the majority of boys sneak off and join his new group of savages. Jack is elated as he speaks to his new followers and begins by addressing himself as their new chief. Jack goes on to tell his followers that they will hunt and not worry about the beast at their end of the island. He also mentions that he plans on persuading more "biguns" to join his tribe and plans on inviting them to a feast. Jack then informs his followers that they will leave a sacrifice for the beast after they kill a pig and proceeds to lead the hunters on an expedition. Unlike Ralph, Jack is fully aware of what truly motivates the boys and knows that they desire to hunt, which is the foundation and focus of his tribe.

In chapter eight, the real split occurs between the two groups of boys and the two leaders. The twins have reported the presence of the beastie atop the mountain (actually the dead pilot caught in his parachute rigging) and Ralph worries that they cannot maintain a signal fire. Jack decides that he's had enough of meetings and fires and shelters and says that he is going to go off on his own and anyone who wants to hunt can join him.

He goes off down the beach and a large group of the choir join him. At this point he says "We'll hunt. I'm going to be chief." It is on page 191 in my text.

After this split, the hunters go off and and kill a pig for a feast and Roger's savagery really begins to emerge. They also decide at this point to go and steal Piggy's glasses so they can have fire.