Luke 2:21 describes the same ritual for Jesus — circumcision and naming on the eighth day, mirroring John's.

Genesis 17:12 establishes the command to circumcise every male on the eighth day — the law behind John's circumcision.

Genesis 21:4 records Abraham circumcising Isaac on the eighth day — the same key detail as John's circumcision.

Leviticus 12:3 commands circumcision on the eighth day as part of purification after childbirth — the law John's family followed.

Acts 7:8 summarizes the covenant of circumcision, including Isaac's eighth‑day circumcision — the same tradition John received.

Philippians 3:5 shows Paul himself was circumcised on the eighth day — another example of the same practice.