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'''Polyeleos''', from the Greek ''πολυέλεος'', from ''πολυ'' ("much" or "many" ) and ''έλεος'', ("mercy"), consists of [[Psalms]] 134 and 135 ([[LXX]]).

Psalms 134 and 135 (LXX). These two psalms constitute the third reading of the [[Psalter ]] at [[Matins ]] on [[Great Feast Feasts]] and certain Sundays [[Sunday]]s (in some places, on all Sundays), and on all other [[All-Night Vigil|Vigil ]] or Polyeleos -rank feasts[[feast]]s. The name "polyeleos" arises from the repetition of the phrase "for His mercy endureth forever" in Psalm 135. On the three Sundays which immediately precede [[Great Lent]], Psalm 136 (LXX) "By the waters of Babylon..." is added to the other two Psalms.<ref>''The Festal Menaion'' (Tr. Mother Mary and Archimandrite Kallistos Ware, Faber and Faber, London, 1984), p. 556ff.</ref>

In [[parish ]] practice, the Psalms are usually abreviatedabbreviated. This is one of the most festive moments of a Vigil, when the [[Royal Doors ]] are opened, and the [[clergy ]] come out of the [[altar ]] and [[censer|cense ]] the entire Churchchurch. <ref>Fr. Victor Potapov, The All-night Vigil Service -- The Evening Sacrifice, September 25, 2007 [http://www.stjohndc.org/Russian/liturgy/e_00_matins.htm#The PolyeleiosThe All-night Vigil Service&mdash;The Evening Sacrifice], September 25, 2007.</ref>