In plain words
Then Rāma: “Lakṣmaṇa! I have no pain. I am acting this way for the sake of the world,” He said. Lakṣmaṇa too knew it: that Rāma had no troubles of any kind, and that no troubles would come to Him.
After three days King Daśaratha reached the city of Mithilā with his family, his kin and friends, thousands of people and his army. Sītā was the one Janaka came upon while the earth was being ploughed. He also had a daughter named Ūrmilā. They decided to give her in marriage to Lakṣmaṇa. Janaka's younger brother Kuśadhvaja had two daughters, Māṇḍavī and Śrutakīrti. They decided to give Māṇḍavī in marriage to Bharata and Śrutakīrti to Śatrughna.
The weddings of the four brothers took place on the same day. The great wedding festival began. Sītā had to put the garland round Rāma's neck. She could not manage to put the garland round the neck of Rāma, whose arms reached to His knees. Feeling it a disgrace to bow His head before a woman in the presence of so many people, Rāma stood without bowing His head. In those days women did not look at men's faces. So Sītā, with her head bowed, was trying hard to put the garland round Rāma's neck. But Rāma's head was beyond her reach. Then Rāma looked towards Lakṣmaṇa: “You are Ādiśeṣa, who bears the earth, are you not! Raise the ground a little where Sītā is standing”: so He signalled, as though saying it. Lakṣmaṇa: “Brother! It is not possible to raise only the spot where Mother Sītā stands. If I raise it, I must raise the whole earth itself,” he let Him know.
All the people were waiting with great eagerness to see the wedding of Sītā and Rāma. “Why is Rāma not bowing His head? Why is Sītā not putting the garland round Rāma's neck?” they whispered among themselves. Seeing how things stood, Lakṣmaṇa came running and fell at Rāma's feet. Once fallen, he would not get up, however long it was. Then Rāma: “Lakṣmaṇa! Get up,” He said, and bent forward to raise him.