This Hymn (in Russian) is sung during the Elevation of the Cross in the Orthodox Church celebrated on September 14 as a commemoration of the finding of the Cross by the Empress Helen (the mother of St. Constantine the Great) on Golgotha in 326 AD, the place where Christ was crucified.
The lyrics in the video are Romanized and not in the original Cyrillic script and some letters are transliterated for the correct pronunciation for Non-Russian speakers
Lyrics (Russian):
Кресту твойему покланяйемся Владыико,
И святойе воскресенийе
Твойе славим.
Lyrics (Romanized):
Krestu tvojemu poklanjajemsja Vladyiko,
I svjatoje voskresenije
Tvoje slavim.
English:
Before Thy Cross, we bow down and worship, O Master, and Thy Holy Resurrection, we glorify