Arba Kosos

Although it is best to drink the entire cup, you are yotzei if you drink the majority of a revi’is (i.e., a bit more than 1.5 fl. oz.), as long as initially there was an entire revi’is of wine in the cup (i.e., 3 fl. oz.). For the last cup, however, an entire revi’is must be drunk.

Every male and female above the age of bar and bas mitzvah must drink each of the arba kosos. Children, both boys and girls, who have reached the age of chinuch should be given arba kosos to drink as well.

If it is difficult to drink pure wine, it may be mixed with grape juice. If this, too, is difficult, grape juice alone may be used.