Story of Jayanta and Sri Ram is found in the Ramayana.
Bhagvan Sri Ram, Mata Sita and Lakshman were residing in the Chitrakuta Mountain
Sri Ram was lying on the lap of Mata Sita and sleeping.
Jayanta came in the form crow and scratched Mata Sita. The painful cry of Sita
woke up Sri Ram.
Bhagavan Sri Ram immediately realized that the crow was
Jayanta and shot the Brahmastra against him.
Fearing for his life, Jayanta flew all over the world. But
the divine arrow followed him.
Trimurtis, Devas and Saints could not save Jayanta. Finally,
Jayanta took refuge at the feet of Sri Ram.
Bhagvan Sri Ram said that the Brahmastra could never become
futile so the arrow will hit the right eye of Jayanta. Accordingly, the arrow
struck the right of eye of Jayanta.
Note – It is also stated in some scriptures that it was not
Brahmastra but darbha grass that Sri Ram threw on Jayanta.