Byzantine Chants for the Dormition of the Virgin Mary

Аггели оуспенїе Пречистыѧ видѣвше, оудивишасѧ какω Дѣваѧ восходитъ ωт земли на небо. – Побеждаются естества оуставы, въ Тебѣ, Дѣво Чистаѧ: дѣвствует бо рождество, и животъ предωбручаетъ смерть: по рождествѣ Дѣва, и по смерти жива, спасаеши приснω, Богородице, наслѣдїе Твое.

This Greek version includes only the second part (“The bounds of nature…”):

Νενίκηνται τῆς φύσεως οἱ ὅροι, ἐν Σοὶ Παρθένε ἄχραντε· παρθενεύει γὰρ τόκος, καὶ ζωὴν προμνηστεύεται θάνατος. Ἡ μετὰ τόκον παρθένος, καὶ μετὰ θάνατον ζῶσα, σῴζοις ἀεί, Θεοτόκε τὴν κληρονομίαν Σου.

The most frequently used chants for any given feast are called the Troparion and the Kontakion (‘tropar’ and ‘kondak’ in the Slavic languages), which are sung at the Divine Liturgy, and repeated at most of the Hours. The former is also called the “dismissal hymn” (apolytikion), since it is the last proper chant of Vespers. Those of the Dormition are as follows, returning to the theme of the Ode given above, which compares the miracle of the Virgin Birth to that of Mary’s passage into the next life.

Troparion In the act of begetting, Thou didst preserve virginity; in the Dormition, Thou didst not forsake the world, o Mother of God. Thou didst change over to life, being the Mother of Life, and by Thy prayers ransoming our souls from death .
Kontakion The tomb and death did not keep hold of the Mother of God, Who resteth not in prayers and intercessions, our unalterable hope. For He that dwelt in Her ever virginal womb translated Her to life, as the Mother of Life.

Тропар Въ рождестве дѣвство сохранила еси, во оуспенїи міра не ωставила еси, Богородице, преставиласѧ еси къ животу, Мати сущи Живота, и молитвами Твоими избавлѧеши ωт смерти души наша.

Кондак Въ молитвахъ Неусыпающую Богородицу и въ предстательствахъ непреложное oупованїе гробї и oумерщвленїе не oудержаста: якоже бо Живота Матерь къ животу престави во oутробу Вселивыйсѧ приснодевственную.

The Greek versions (in two separate videos):

Τροπάριον Ἐν τῇ Γεννήσει τὴν παρθενίαν ἐφύλαξας, ἐν τῇ Κοιμήσει τὸν κόσμον οὐ κατέλιπες Θεοτόκε. Μετέστης πρὸς τὴν ζωήν, μήτηρ ὑπάρχουσα τῆς ζωῆς, καὶ ταῖς πρεσβείαις ταῖς σαῖς λυτρουμένη, ἐκ θανάτου τὰς ψυχὰς ἡμῶν.

Κοντάκιον Τὴν ἐν πρεσβείαις ἀκοίμητον Θεοτόκον, καὶ προστασίαις ἀμετάθετον ἐλπίδα, τάφος καὶ νέκρωσις οὐκ ἐκράτησεν· ὡς γὰρ ζωῆς Μητέρα, πρὸς τὴν ζωὴν μετέστησεν, ὁ μήτραν οἰκήσας ἀειπάρθενον.