अथ खल्वात्मसंमितमतिमृत्यु सप्तविधं सामोपासीत हिंकार इति त्र्यक्षरं प्रस्ताव इति त्र्यक्षरं तत्समम् ॥ २.१०.१ ॥
In plain words
Now let a man worship the sevenfold Sāman, measured within itself and leading beyond death. Hiṃkāra has three syllables, prastāva has three syllables: these are equal.