Devibhagavatapurana 3.29.41

3.29.41

vānarāḥ santi bhūyāṃso gamiṣyanti caturdiśam |
śuddhiṃ janakanandinyā ānayiṣyanti te kila ||

There are multitudes of monkeys, who are our helping hands; they will go to all the four quarters and bring back to us the news of the daughter of Janaka; there is no doubt in this.