And these are the ends of rows: [If] two workers started from the middle of the row, one facing north and one facing south, and they forgot [sheaves] in front of them and behind them —- that which is in front of them is deemed shich'chah and that which is behind them is not deemed shich'chah. [If] a lone worker started from the end of a row and forgot [sheaves] in front of him and behind him —- what is in front of him is not shich'chah, but what is behind him is shich'chah because it is governed by [the prohibition] (Deut. 24:19): Do not turn back.  This is the rule: Whatever is governed by “do not turn back” is shich'chah; whatever is not governed by “do not turn back” is not shich'chah.