Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 34

Sanskrit:

इत्थं स्वभर्तृगदितं भगवन्महित्वंसंस्मृत्य विस्मितधियो यमकिङ्करास्ते ।नैवाच्युताश्रयजनं प्रतिशङ्कमानाद्रष्टुं च बिभ्यति तत: प्रभृति स्म राजन् ॥ ३४ ॥

ITRANS:

itthaṁ svabhartṛ-gaditaṁ bhagavan-mahitvaṁsaṁsmṛtya vismita-dhiyo yama-kiṅkarās tenaivācyutāśraya-janaṁ pratiśaṅkamānādraṣṭuṁ ca bibhyati tataḥ prabhṛti sma rājan

Translation:

After hearing from the mouth of their master about the extraordinary glories of the Lord and His name, fame and attributes, the Yamadūtas were struck with wonder. Since then, as soon as they see a devotee, they fear him and dare not look at him again.

Purport:

Since this incident, the Yamadūtas have given up the dangerous behavior of approaching devotees. For the Yamadūtas, a devotee is dangerous.