Who wrote Come fill the cup and in fires of spring winter garment repentance fling?

The lines "Come fill the cup" and "In fires of spring winter garment repentance fling" are from "The Rubáiyát of Omar Khayyám", a collection of quatrains attributed to the 11th-century Persian poet and astronomer Omar Khayyám.

However, the specific translation of these lines is most likely from Edward FitzGerald's 1859 English translation of the Rubáiyát. FitzGerald's version popularized Khayyám's work in the West and is considered a classic of English literature.