Caitanya-caritāmṛta 20.152
śrotāra pada-reṇu karoṅ mastaka-bhūṣaṇa tomarā e-amṛta pile saphala haila śrama
[shrotaara pada-renu karon mastaka-bhooshana tomaraa e-amrita pile saphala haila shrama]
Blended reading (Sanskrit + English inline)
śrotāra pada-reṇu karoṅ mastaka-bhūṣaṇa tomarā e-amṛta pile saphala haila śrama
I decorate my head with the dust of the lotus feet of my audience. Now you have all drunk this nectar, and therefore my labor is successful.
My note
Source: vedabase.io