Deuteronomy 19:2 commands the establishment of cities of refuge, which is fulfilled in Joshua 20:2-3 when Joshua sets apart these cities for those who accidentally kill someone to flee to.
Deuteronomy 19:15 establishes the principle of requiring two or three witnesses to confirm a matter, which Jesus reiterates in Matthew 18:16 as a standard for resolving disputes within the church.
Deuteronomy 19:21 prescribes the law of retaliation, 'eye for eye, tooth for tooth,' which Jesus addresses in Matthew 5:38-39, teaching a higher standard of not resisting an evil person and turning the other cheek.
Deuteronomy 19:3 instructs the preparation of roads to the cities of refuge, which is also mentioned in Numbers 35:6, emphasizing the accessibility and importance of these cities for those seeking asylum.