Deuteronomy 24:21

When thou gatherest the grapes of thy vineyard, thou shalt not glean it afterward: it shall be for the stranger, for the fatherless, and for the widow.

Cross-references

Deuteronomy 24:21 applies the same gleaning law to grape harvesting — leave leftover grapes for the poor and vulnerable.

Leviticus 19:9 gives the same command to leave grain at the edges of the field for the poor — the foundational law behind this verse.

Leviticus 19:10 specifically forbids going over a vineyard twice — the exact vineyard gleaning rule echoed here.