SB 9.10.8
yah satya-pasa-parivita-pitur nidesam
strainasya capi sirasa jagrhe sabharyah
rajyam sriyam pranayinah suhrdo nivasam
tyaktva yayau vanam asun iva mukta-sangah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Carrying out the order of His father, who was bound by a promise to his wife, Lord Ramacandra left behind His kingdom, opulence, friends, well-wishers, residence and everything else, just as a liberated soul gives up his life, and went to the forest with Sita.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Maharaja Dasaratha had three wives. One of them, Kaikeyi, served him very pleasingly, and he therefore wanted to give her a benediction. Kaikeyi, however, said that she would ask for the benediction when it was necessary. At the time of the coronation of Prince Ramacandra, Kaikeyi requested her husband to enthrone her son Bharata and send Ramacandra to the forest. Maharaja Dasaratha, being bound by his promise, ordered Ramacandra to go to the forest, according to the dictation of his beloved. And the Lord, as an obedient son, accepted the order immediately. He left everything without hesitation, just as a liberated soul or great yogi gives up his life without material attraction.