What joke did Li Yuan say that almost ruined the national luck of the Tang Empire?

Tang gaozu's joke almost ruined the national fortune of the Tang Empire. My brother and sister-in-law know that they are the only son of heaven and the second brother-in-law. It's a joke. What he means is that your family often trains emperors, and it's only a joke to add men to them next time, but he is also very proud. Dwayne was very angry with this remark and was scolded for his failure in this election, so he decided to betray Tang Gaozu. He wants to do something big with his high power. He told his confidants that my daughter was rich, too. His plan was that when Li Shimin joined forces with Tang Jun, Dugu Huai 'en planned to destroy Li Shimin and give the position of Hedong to Liu Wuzhou, but it was unlucky. Before the plan was implemented, the battle had already begun, and his land in the military camp could not be put into use. Later, after the battle failed, he was captured. But it wasn't long before he escaped. It seemed like a scene. He may have faked his escape from prison in the agreement reached with him in the government, and then came out to sabotage it. He wanted to betray the Tang Dynasty. After running back, Tang Yuan is his relative, and I don't blame him. He continued to let him lead the troops stationed in the Yellow River. By this time, the enemy had surrendered. When he marched, Tang Yuan also went to the Yellow River, ready to cross the river and become his. DuGuHuaiEn, he was very happy, because he wanted to kill Li Shimin, but a general came, but Tang Gaozu didn't know. When he was about to cross the river, a man told him that Dugu Huaien had defected. Because he ran away without consulting his men, he ran out by himself, and his confidant knew his plan and told him. Yuan Jun knows that everyone has been captured, so the war is over. They also know that the possibility of Dugu Huai 'an's escape is related to the rebellion, so be careful of him. When Tang briefly exposed him, there was no other way to expose him, but he knew in his heart that he had let go. Letting him run day and night always prevents Tang Gaozu from crossing the river. He was startled, but pretended that there was nothing on the surface and ordered Du to come over, but he didn't expect his plot to be defeated. Crossing the river would paralyze the emperor and he couldn't go back when he came back.