"One-fourth" means one part out of four equal parts. This can be written in modern measurements. Alternate translation: "a liter" or "one-fourth of a hin (which is almost 1 liter)" (See: [[rc://en/ta/man/translate/translate-fraction]] and [[rc://en/ta/man/translate/translate-bvolume]])
This sentence describes the drink offering that is to accompany the lamb. The full meaning of this statement can be made clear. Alternate translation: "It must be a drink offering of strong drink and you must pour it out in the holy place to Yahweh" (See: [[rc://en/ta/man/translate/figs-explicit]])