The rich man replied that they would listen if someone came back from the dead. Abraham concluded by saying they would not even listen to someone who came back from the dead. This explains why Jesus uses the name Lazarus in this parable. Jesus also came back from the dead, and the church leaders did not listen to Him either. Therefore I speak to them in parables, because seeing they do not see, and hearing they do not hear, nor do they understand.
People miss the lesson of parables by trying to take everything literally.
When we die, our physical bodies lie still in the grave. We decompose and eventually turn to dust. This includes our eyes, fingers, and tongue. Abraham's bosom is not mentioned anywhere else in the Bible. Since many righteous people died before Abraham, they could not go to his bosom before it existed.