Some other rulings related to the one who abandons prayer.

The Shaykh : These are the rulings for the one who does not pray in this world, and there are other rulings, but they are less significant than what we have mentioned, such as: the obligation to boycott him and not to greet him, because he is a disbeliever.
And if the Prophet (peace and blessings be upon him) boycotted Ka'b ibn Malik and his two companions for their absence from the Battle of Tabuk.
And this action does not lead to disbelief.
So what about the one who is a disbeliever?