Deuteronomy 23:25

23:25 When you go into the ripe grain fields of your neighbor you may pluck off the kernels with your hand, ¹  but you must not use a sickle on your neighbor’s ripe grain.

Deuteronomy 25:18

25:18 how they met you along the way and cut off all your stragglers in the rear of the march when you were exhausted and tired; they were unafraid of God. ² 

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¹ sn For the continuation of these practices into NT times see Matt 12:1-8; Mark 2:23-28; Luke 6:1-5.

² sn See Exod 17:8-16.