Deuteronomy 24:19-21 commands leaving forgotten sheaves for the poor, which Boaz enacts by pulling stalks for Ruth.

1 John 3:17 condemns withholding from a needy brother; Boaz does the opposite by generously providing for Ruth.

1 John 3:18 calls for love in deed, not just words; Boaz demonstrates this by his practical provision for Ruth.

Leviticus 23:22 commands leaving gleanings for the poor; Boaz follows and exceeds this law by instructing extra grain.