Does divorce take effect if the husband swears, "By God Almighty, consider our relationship over," should his wife send a message to his sister, and then the wife sends the message?

The phrase uttered by the husband is a metaphor that could signify divorce or something else. If he intended to make the divorce contingent on his wife sending a message to his sister, then divorce occurs upon her sending it. However, if he did not intend divorce, then it does not occur. The husband should be asked under oath about his intention. If he does not do what he threatened, then he must offer expiation for breaking an oath.