Lobsh is a Coptic word meaning explanation and it is an ecclesiastical term used in praises. It is a portion or a few ones used as an ending for the canticle (Hose). The first canticle lobsh is prayed in the midnight praise after the first Hose that is Moses and Israelites' praise after crossing the red sea (Exodus 15).
Credits to Archangel Michael Coptic Orthodox Church, Santa Ana , CA   / archangelmichaeloc   for the great performance.
The whole hymn with translations: https://sttakla.org/LyricsSpiritual...
My favorite performance of this hymn and my favorite hymn performance of all time is here by David Ensemble:   / jlemh8m5grfl