The key words in verse 31 are “Get rid of all”. This is a command, an imperative. It is not an order. What is the difference? A command is something to be obeyed right now in the right way. “About Face.” “Forward March!” “Halt!” There is nothing “iffy” about a command. If it is not obeyed right now it is disobedience. An order still has to be obeyed, but it might take some time and may be done in different ways. “Invade and occupy Europe.”
“Get rid of all” is a command. If it is obeyed there will be no bitterness, rage, anger, brawling and slander, or malice by tomorrow. If any of these attributes are still here tomorrow, “Get rid of all” was not obeyed.
We see this command again in Colossians 3:8.
“But now you must also rid yourselves of all such thing…