Śaiśirīya Śikṣā 82

82

bhītā patanabhedābhyāṃ tadvadvarṇān prayojayet
saṃhitānayate sūryaṃ padāni śaśinaḥ padam

fearful of dropping or piercing them, so should one employ the phonemes; / continuous recitation leads to the sun; word-by-word recitation [leads] to the moon's abode;