The gift is the pig's head on a stick which Jack leaves as an offering to the beast. The beast is not an animal it is simply the evil within each and every one of us, something which Golding also refers to as 'the darkess of man's heart' in the last chapter. So essentially Jack and his tribe by paying homage to the beast are really giving themselves over as a gift to the darkness, or the evil, within themselves.
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He leaves Ralph's group in Chapter Eight: Gift for the Darkness on page 127.
Jack made his announced his own tribe in Chapter 8: Gift for the Darkness. He said "I'm going off by myself. He can catch his own pigs. Anyone who wants to hunt when I do can com too." In the end of he chapter Jack tries to show his power and steal Piggys specs.
You need to read the chapter. We don't do homework for students nor do we do summaries.
That quote comes from the internalised conversation that Simon has with the beast within himself, during an epileptic fit. It is from chapter 8: Gift For The Darkness, a couple of paragraphs from the end, on page 158 in my edition of the book.
When Ralph said, in chapter 8: Gift for the Darkness, and I quote "We've no fire. That thing sits up there-- we'll have to stay here." Piggy replied, "We got no fire on the mountain. But what's wrong with a fire down here?"