Deuteronomy 26:10 describes the act of presenting firstfruits, which is the very offering commanded as priestly due in Deuteronomy 18:4.

Deuteronomy 26:2 commands bringing the first of the produce to the sanctuary — the same firstfruits law as here.

Exodus 22:29 also commands offering firstfruits, reinforcing the same principle as the priestly portion in Deuteronomy 18:4.

Exodus 23:19 commands bringing firstfruits to the house of the LORD, which is the same offering designated for priests in Deuteronomy 18:4.

Leviticus 23:10 specifies a firstfruits sheaf given to the priest, directly relating to the broader firstfruits command in Deuteronomy 18:4.

Leviticus 23:17 details another firstfruits offering (wave loaves), related to the priestly portion commanded in Deuteronomy 18:4.

Numbers 18:12-24 expands on the same priestly due of firstfruits and explains priests have no inheritance, complementing Deuteronomy 18:4.

2 Chronicles 31:4-10 shows faithful giving of firstfruits to priests in Hezekiah’s reform, echoing the command in Deuteronomy 18:4.

Nehemiah 12:44-47 records the restoration of firstfruits offerings to priests, implementing the law of Deuteronomy 18:4.

Leviticus 23:20 explicitly mentions the priest receiving the bread of firstfruits as a wave offering — directly parallel.

Numbers 5:9 states that all holy offerings brought to the priest become his — reinforcing the principle behind firstfruits.

Nehemiah 10:37 records the post-exile commitment to bring firstfruits to the priests' storerooms — a later application.

Ezekiel 44:30 directly reiterates that the first of all firstfruits belongs to the priests — a clear restatement.

Numbers 18:20 says the Lord is the Levites' inheritance because they have no land — firstfruits support them as their portion.

Romans 11:16 uses firstfruits metaphorically to show the holy remnant sanctifies the whole — an NT theological parallel.