Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
The corners of fields were not to be reaped, and the sheaf accidentally left behind was not to be fetched away, according to the law of Moses (Lev. 19:9, 23:22; Dt. 24:21). They were to be left for the poor to glean. Similar laws were given regarding vineyards and oliveyards. (Comp. Ruth 2:2.)