I know what you are trying to do, as some others have done in the past to prove their point, and that is you want those exact words to be in the scripture. However depending on who is speaking and the verbiage they use to explain something says the same as lose salvation but in different words.
Let me start with giving two questions, then follow it with Luke 12;
Where do unbelievers go at judgment ?
Does the bible only state not believing in Jesus is unbelief, or does it say disobedience is also unbelief ?
Luke 12:45-48
45 But if that servant says in his heart, ‘My master is delaying his coming,’ and begins to beat the male and female servants, and to eat and drink and be drunk, 46 the master of that servant will come on a day when he is not looking for him, and at an hour when he is not aware, and will cut him in two and appoint him his portion with the unbelievers.
47 And that servant who knew his master’s will, and did not prepare himself or do according to his will, shall be beaten with many stripes.48 But he who did not know, yet committed things deserving of stripes, shall be beaten with few. For everyone to whom much is given, from him much will be required; and to whom much has been committed, of him they will ask the more.
The context here is that the punishment a believer (servant) will face will be worse at judgment then the punishment that a unbeliever who never knew the Lord will face. Because they lived a life of disobedience even though he knew what the Lord requires of him to do (how to live), and did not do it.