The same text (allowing for some spelling differences, e.g. "wassel") is given in "Ancient Songs: From the Time of King Henry the Third, to the Revolution by Joseph Ritson (London: J. Johnson, 1790), page 304, with the following heading:

A CARROL FOR A WASSEL BOWL, TO BE SUNG UPON TWELFTH DAY AT NIGHT
To the Tune of Gallants, come away.

From a collection intitled, "New Christmas Carrols: Being fit also to be sung at Easter, Whitsontide, and other Festival days in the year." no date, 12mo, black letter; in the curious study of that ever to be respected antiquary Mr. Anthony à Wood, in the Ashmoleian Museum.