Jacob 5
“The Israelites had a yearly festival, at the end of their year, called the feast of ingathering (Ex. 23:16; 34:22), because on that occasion the people were required to give thanks especially for the harvest of fields and vineyards. It has been suggested that this song, or poem, was composed and recited on such an occasion. It contains a parable in which Israel is represented as a vineyard (as in Is.3:14), and the consequences of the neglect of unfaithful keepers (Matt. 21:33-41).” (G. Reynolds and J. Sjodahl, Commentary on the Book of Mormon, 1:333)