This metaphor means that false prophets will pretend they they are good and want to help people, but they are really evil and will do people harm. (See: [[rc://en/ta/man/translate/figs-metaphor]])
This metaphor refers to a person's actions. AT: "Just as you know a tree by the fruit that grows on it, you will know false prophets by how they act" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Jesus uses a question to teach the people. The people would have known that the answer is no. AT: "People do not gather ... thistles." (See: [[rc://en/ta/man/translate/figs-rquestion]])
Jesus continues to use the metaphor of fruit to refer to good prophets who produce good works or words. (See: [[rc://en/ta/man/translate/figs-metaphor]])