What is the ruling regarding a husband saying to his wife: "Today will be your divorce, today you will be divorced, today I want to divorce you, today you are divorced," and then they reconcile in the same sitting, with the wife being unsure if the husband uttered the last phrase?

If the phrases are understood as a threat of divorce and not an actual pronouncement of it, and since the husband reconciled with his wife and did not divorce her afterwards, then nothing takes effect. The husband is advised to avoid using words of divorce, as it was not legislated to vent anger, and its repeated use destroys trust between spouses and exposes the family to ruin.