From the YouTube page:
Josquin des Prez (c. 1450 to 1455 August 27, 1521), often referred to simply as Josquin, was a Franco-Flemish composer of the Renaissance. He is also known as Josquin Desprez, a French rendering of Dutch "Josken van de Velde", diminutive of "Joseph van de Velde" ("of the fields"), and Latinized as Josquinus Pratensis, alternatively Jodocus Pratensis. He was the most famous European composer between Guillaume Dufay and Palestrina, and is usually considered to be the central figure of the Franco-Flemish School. Josquin is widely considered by music scholars to be the first master of the high Renaissance style of polyphonic vocal music that was emerging during his life
Original text and translations may be found at Psalm 91.. The text set by Josquin is the first eight verses of the Latin Vulgate (which is numbered as Psalm 90).
Psalmus 90, 18 (Vulgate)
90:1 Qui habitat in adjutorio Altissimi, in protectione Dei cæli commorabitur. 2 Dicet Domino: Susceptor meus es tu et refugium meum; Deus meus, sperabo in eum. 3 Quoniam ipse liberavit me de laqueo venantium, et a verbo aspero. 4 Scapulis suis obumbrabit tibi, et sub pennis ejus sperabis. 5 Scuto circumdabit te veritas ejus: non timebis a timore nocturno; 6 a sagitta volante in die, a negotio perambulante in tenebris, ab incursu, et dæmonio meridiano. 7 Cadent a latere tuo mille, et decem millia a dextris tuis; ad te autem non appropinquabit. 8 Verumtamen oculis tuis considerabis et retributionem peccatorum videbis.
Psalm 91, 18 (King James Version)
91:1 He that dwelleth in the secret place of the most High shall abide under the shadow of the Almighty. 2 I will say of the Lord, He is my refuge and my fortress: my God; in him will I trust. 3 Surely he shall deliver thee from the snare of the fowler, and from the noisome pestilence. 4 He shall cover thee with his feathers, and under his wings shalt thou trust: his truth shall be thy shield and buckler. 5 Thou shalt not be afraid for the terror by night; nor for the arrow that flieth by day; 6 Nor for the pestilence that walketh in darkness; nor for the destruction that wasteth at noonday. 7 A thousand shall fall at thy side, and ten thousand at thy right hand; but it shall not come nigh thee. 8 Only with thine eyes shalt thou behold and see the reward of the wicked.
Performed : Huelgas Ensemble
Dir : Paul Van Nevel
(Here's the chant version, from ReneGoupil:
Lent - First Sunday: Tract from Corpus Christi Watershed on Vimeo.