Jesus responds with a proverb to teach the man about being his disciple. Jesus means that a person is not suitable for the kingdom to God if he focuses on people in his past instead of following Jesus. (See: [[rc://en/ta/man/jit/writing-proverbs]] and [[rc://en/ta/man/jit/figs-explicit]])
Here "puts his hand to" something is an idiom that means the person starts to do something. Alternate translation: "No one who starts to plow his field" (See: [[rc://en/ta/man/jit/figs-idiom]] and [[rc://en/ta/man/jit/translate-unknown]])