On the morning of June 5, 1967, Israeli Prime Minister Eshkol transmitted through the Chief of Staff of UNTSO a message to King Hussein of Jordan, asking Jordan to refrain from hostilities. Here is the full text of the message:
We are engaged in defensive fighting on the Egyptian sector, and we shall not engage ourselves in any action against Jordan, unless Jordan attacks us. Should Jordan attack Israel, we shall go against her with all our might.
Israel received no response to the message, and late that morning Jordan opened fire along the entire armistice line with Israel, shelling Jerusalem. At noon, Jordanian soldiers occupied the United Nations headquarters.
In the afternoon, Israel opened its counterattack, and two days later had taken the Old City of Jerusalem and the entire West Bank. On the evening of June 7, Jordan accepted the cease-fire and fighting stopped.
More here. This would be a good day to re-read Anne Lieberman’s “Six Days Remembered.”