Ramayana
रामो ऽपि रेमे तैः सार्धं वानरैः कामरूपिभिः । राक्षसैश्च महावीर्यैर्ऋक्षैश्चैव महाबलैः ॥ 7-39-28 ॥
Rama too took his delight together with those monkeys who could change their form at will, with the rakshasas of great valor, and with the mighty bears.
english translation