O King, a saintly person is just like water because he is free from all contamination, gentle by nature, and by speaking creates a beautiful vibration like that of flowing water. Just by seeing, touching or hearing such a saintly person, the living entity is purified, just as one is cleansed by contact with pure water. Thus a saintly person, just like a holy place, purifies all those who contact him because he always chants the glories of the Lord.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
स्वच्छः प्रकृतितः स्निग्धो माधुर्यस्तीर्थभूर्नृणाम् । मुनिः पुनात्यपां मित्रमीक्षोपस्पर्शकीर्तनैः
svacchaḥ prakṛtitaḥ snigdho mādhuryastīrthabhūrnṛṇām | muniḥ punātyapāṃ mitramīkṣopasparśakīrtanaiḥ
SB 11.7.44