I posted this in my theological Facebook group:
Jesus taught a whole parable in which a man lost his salvation – Matthew 18 – The unforgiving servant.
THE SERVANT WAS FORGIVEN:
Mat 18:27 – Then the lord of that servant was moved with compassion, and loosed him, and forgave him the debt.
THE SERVANT LOST HIS FORGIVENESS:
Mat 18:34 – And his lord was wroth, and delivered him to the tormentors, till he should pay all that was due unto him.
JESUS WARNED BELIEVERS CAN LOSE THEIR PARDON TOO:
Mat 18:35 – So likewise shall my heavenly Father do also unto you, if ye from your hearts forgive not every one his brother their trespasses.