Chāndogya Upaniṣad 2.22.4

2.22.4

atha yady enam ūṣmāsūpālabheta \
prajāpatiṃ śaraṇaṃ prapanno 'bhūvaṃ sa tvā (S ) enaṃ brūyāt \
atha yady enaṃ sparśeṣūpālabheta \
mṛtyuṃ śaraṇaṃ prapanno 'bhūvaṃ sa tvā (S ) enaṃ brūyāt \\222.4\

4. So, if one should reproach him on his spirants, let him say to that one: ‘I have been a suppliant to Prajāpati for protection. He will thrash you.’

So, if one should reproach him on his [other] consonants, let him say to that one: ‘I have been a suppliant to Mṛityu (Death) for protection. He will burn you up.’