BṚHADĀRAṆYAKA UPANISHAD · 1.3.28

अथातः पवमानानाम् एवाभ्यारोहः ।
स वै खलु प्रस्तोता साम प्रस्तौति ।
स यत्र प्रस्तुयात् तद् एतानि जपेत् ।
असतो मा सद् गमय, तमसो मा ज्योतिर् गमय, मृत्योर् मामृतं गमयेति ।
स यद् आहासतो मा सद् गमयेति ।
मृत्युर् वा असत् सद् अमृतं मृत्योर् मामृतं गमयामृतं मा कुर्व् इत्य् एवैतद् आह ।
तमसो मा ज्योतिर् गमयेति ।
मृत्युर् वै तमो ज्योतिर् अमृतं मृत्योर् मामृतं गमयामृतं मा कुर्व् इत्य् एवैतद् आह ।
मृत्योर् मामृतं गमयेति ।
नात्र तिरोहितम् इवास्ति ।
अथ यानीतराणि स्तोत्राणि तेष्व् आत्मने ऽन्नाद्यम् आगायेत् ।
तस्माद् उ तेषु वरं वृणीत ।
यं कामं कामयेत् तम् ।
स एष एवंविद् उद्गातात्मने वा यजमानाय वा यं कामं कामयते तम् आगायति ।
तद् धैतल् लोकजिद् एव ।
न हैवालोक्यताया आशास्ति य एवम् एतत् साम वेद ॥

athātaḥ pavamānānām evābhyārohaḥ ।
sa vai khalu prastotā sāma prastauti ।
sa yatra prastuyāt tad etāni japet ।
asato mā sad gamaya, tamaso mā jyotir gamaya, mṛtyor māmṛtaṃ gamayeti ।
sa yad āhāsato mā sad gamayeti ।
mṛtyur vā asat sad amṛtaṃ mṛtyor māmṛtaṃ gamayāmṛtaṃ mā kurv ity evaitad āha ।
tamaso mā jyotir gamayeti ।
mṛtyur vai tamo jyotir amṛtaṃ mṛtyor māmṛtaṃ gamayāmṛtaṃ mā kurv ity evaitad āha ।
mṛtyor māmṛtaṃ gamayeti ।
nātra tirohitam ivāsti ।
atha yānītarāṇi stotrāṇi teṣv ātmane ’nnādyam āgāyet ।
tasmād u teṣu varaṃ vṛṇīta ।
yaṃ kāmaṃ kāmayet tam ।
sa eṣa evaṃvid udgātātmane vā yajamānāya vā yaṃ kāmaṃ kāmayate tam āgāyati ।
tad dhaital lokajid eva ।
na haivālokyatāyā āśāsti ya evam etat sāma veda ॥

Next follows the Abhyâroha (the ascension) of the Pavamâna verses. Verily the Prastotri begins to sing the Sâman, and when he begins, then let him (the sacrificer) recite these (three Yagus-verses): 'Lead me from the unreal to the real! Lead me from darkness to light! Lead me from death to immortality!' Now when he says, 'Lead me from the unreal to the real,' the unreal is verily death, the real immortality. He therefore says, 'Lead me from death to immortality, make me immortal.' When he says, 'Lead me from darkness to light,' darkness is verily death, light immortality. He therefore says, 'Lead me from death to immortality, make me immortal.' When he says, 'Lead me from death to immortality,' there is nothing there, as it were, hidden (obscure, requiring explanation). Next come the other Stotras with which the priest may obtain food for himself by singing them. Therefore let the sacrificer, while these Stotras are being sung, ask for a boon, whatever desire he may desire. An Udgâtri priest who knows this obtains by his singing whatever desire he may desire either for himself or for the sacrificer. This (knowledge) indeed is called the conqueror of the worlds. He who thus knows this Sâman, for him there is no fear of his not being admitted to the worlds.

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)