My chiefest glory, gain, and bliss, O stranger Prince, I reckon this, That Raghu’s son will condescend To seek the Vánar for his friend. If thou my true ally wouldst be Accept the pledge I offer thee, This hand in sign of friendship take, And bind the bond we ne’er will break.”

In plain words: Sugriva says the greatest honor of his life would be for Rama to become his friend. He offers his hand as a promise of friendship that will never be broken.