CHĀNDOGYA UPANISHAD · 1.8.6

तं ह शिलकः शालावत्यश् चैकितायनं दाल्भ्यम् उवाचाप्रतिष्ठितं वै किल ते दाल्भ्य साम ।
यस् त्व् एतर्हि ब्रूयान् मूर्धा ते विपतिष्यतीति मूर्धा ते विपतेद् इति ॥

taṃ ha śilakaḥ śālāvatyaś caikitāyanaṃ dālbhyam uvācāpratiṣṭhitaṃ vai kila te dālbhya sāma ।
yas tv etarhi brūyān mūrdhā te vipatiṣyatīti mūrdhā te vipated iti ॥

Then said Silaka Sâlâvatya to Kaikitâyana Dâlbhya: 'O Dâlbhya, thy Sâman is not firmly established. And if any one were to say, Your head shall fall off (if you be wrong), surely your head would now fall.'

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)