A member of our congregation has been separated from his wife for over a year. His wife just called to inform me that he has filed for a divorce.  She says that the papers she has been served with state that the reason for the divorce is "for the betterment of the family". I believe this to be willful sin on his part and that the members here need to go talk to him and try to convince him that (as he knows) what he is doing is completely unscriptural and request that he not go through with the divorce.  If he still refuses to do so we should withdraw from him. 

I realize that its hard for you to offer any advice not being here and knowing the details, but would you not agree that I am right? 

Since God clearly states that He hates divorce (Malachi 2:14-16) and that this divorce appears to be completely unnecessary, from what you tell me; then yes, I agree the man needs to be talked to and action taken if he doesn't repent of his sins. One thing that needs to be kept in mind: in these days of "no fault" divorces, what the lawyers chose to put on the papers likely do not match the actual reason. He should be clearly informed that if he proceeds with this divorce, he has no grounds for future remarriage.

See also:

Questions and Answers regarding Divorce
Questions and Answers regarding Withdrawal