Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 31
Sanskrit:
एतैर्दोषैर्विहीनाय ब्रह्मण्याय प्रियाय च ।साधवे शुचये ब्रूयाद् भक्ति: स्याच्छूद्रयोषिताम् ॥ ३१ ॥
ITRANS:
etair doṣair vihīnāyabrahmaṇyāya priyāya casādhave śucaye brūyādbhaktiḥ syāc chūdra-yoṣitām
Translation:
This knowledge should be taught to one who is free from these bad qualities, who is dedicated to the welfare of the brāhmaṇas, and who is kindly disposed, saintly and pure. And if common workers and women are found to have devotion for the Supreme Lord, they are also to be accepted as qualified hearers.