This dream so impresses him as a divine communication, and the warning so troubles him that he cannot sleep, but calls all his servant and reports what God has said to him, a warning to them also as they see it. Abimelech’s servants also have a fear of the one true God.
It is not acceptable for God’s people to deal with liars, by responding to them in return with lies. We are to overcome evil with good, and lies with truth, not to be overcome by resorting to them ourselves (Romans 12:21). We may appear to put ourselves at a disadvantage by always speaking the truth, but we must trust God to protect us in this. Apart from anything else, if we live like that, then on the rare occasion we meet with truthful people, we will have nothing to be ashamed of.