An NPM top-25 best known as an art song rather than in the older form of plainsong with the full text, Sacris Solemniis. The final two strophes begin at 3:04 in this media link.
The Easter hymn is a variant of the traditional chant Surrexit Christus. But it’s not the only development from the original. Here’s an English Renaissance setting performed by New York Polyphony.