Caitanya-caritāmṛta 4.7
pūrve yena pṛthivīra bhāra haribāre kṛṣṇa avatīrṇa hailā śāstrete pracāre
[poorve yena prithiveera bhaara haribaare krishna avateerna hailaa shaastrete prachaare]
Blended reading (Sanskrit + English inline)
pūrve yena pṛthivīra bhāra haribāre kṛṣṇa avatīrṇa hailā śāstrete pracāre
The scriptures proclaim that Lord Kṛṣṇa previously descended to take away the burden of the earth.
My note
Source: vedabase.io