Describe, with text support, what will happen if Jonas leaves the community?

We don't know what will happen until it actually takes place. Upon reaching the opposite side of the river, Jonas looks back at the community and realizes that his orderly, easy life without a past has ended. He has broken too many rules now to let himself be caught, such as leaving his dwelling at night, stealing leftovers, and taking his father's bike because of its child seat. In addition, he has stolen Gabriel, who is sleeping behind him with the soothing memory of lying on a hammock on a beach.

Jonas rides as far as he can, avoiding all communities as much as he can. The next morning, he feeds Gabe in an isolated area near a stream. They sleep hidden in the trees after Jonas transmits a memory of contented exhaustion.

After many days, Jonas's legs have become stronger, showing that he does not need The Giver's memories of strength that he would have received. However, he wishes for more courage every time he sees a search plane. Remembering that they use a heat-seeking device, he shares memories of snow and cold with Gabe whenever a plane approaches in order to hide them, although the memories grow shallower as he moves farther away from the community--just as he hoped and planned. He watches vigilantly for planes, but eventually the planes cease searching.