Caitanya-caritāmṛta 6.29
bhakti-upadeśa vinu tāṅra nāhi kārya ataeva nāma haila ‘advaita ācārya’
[bhakti-upadesha vinu taanra naahi kaarya ataeva naama haila ‘advaita aachaarya’]
Blended reading (Sanskrit + English inline)
bhakti-upadeśa vinu tāṅra nāhi kārya ataeva nāma haila ‘advaita ācārya’
Since He has no other occupation than to teach devotional service, His name is Advaita Ācārya.
My note
Source: vedabase.io