अथ यत्रोपाकृते प्रातरनुवाके न पुरा परिधानीयाया ब्रह्मा व्यवदत्युभे एव वर्तनी संस्कुर्वन्ति न हीयतेऽन्यतरा ॥ ४.१६.४ ॥
In plain words
But if, after the morning litany has begun, the Brahman priest does not break silence before the closing verse, they fashion both tracks, and neither is neglected.