Here for a while, I pray thee, light And rest upon the breezy height. A prince of Raghu’s line was he Who gave his glory to the Sea, Who now to Ráma’s envoy shows High honour for the debt he owes.

In plain words: The mountain asks Hanuman to land and rest for a while. It explains that the Sea owes a debt to Rama's family, the line of Raghu, so the Sea wants to honour Rama's messenger.