Lord Hanuman had earned the reputation of being notorious during his childhood. He used to pester meditating hermits, who had taken refuge in the kingdom of his father, King Kesari.
During one such incident,
an annoyed sage had hexed Hanuman. Due to the spell Hanuman was unable
to remember the powers vested in him by the deities unless someone
reminded him of it. When Sita was kidnapped by Ravana, Jambavantha had
to remind Hanuman of his powers, so that he could pursue the search