Acts 21:26 shows Paul carrying out the purification ritual described in the instruction, confirming his obedience.

Acts 18:18 shows Paul himself cutting his hair for a vow — directly paralleling his sponsorship of others' Nazirite completion in Acts 21:24.

Acts 24:18 recalls this same purification event when Paul defends himself, providing later testimony.

Numbers 6:5 forbids shaving during a Nazirite vow — the opposite of the completion shaving Paul finances, but both are Nazirite regulations.

Numbers 6:13 prescribes bringing a Nazirite to the tabernacle when the vow ends — directly matching Paul's sponsoring of this completion ceremony.

Numbers 6:18 explicitly commands the Nazirite to shave his head at the tabernacle door — the exact ritual Paul facilitates for the four men.

1 Corinthians 9:20 reveals Paul's principle of becoming a Jew to win Jews, explaining his willingness to follow the vow in Acts 21:24 to avoid offending Jewish believers.

Numbers 6:2 provides the OT law for the Nazirite vow that the four men in Acts 21:24 were fulfilling, explaining the purification and shaving.

Galatians 2:12 shows Peter's fear of the circumcision party, the same pressure that prompted the advice for Paul to prove he lives under the law in Acts 21:24.

Judges 13:5 identifies Samson as a lifelong Nazirite — a different vow type but shares the Nazirite concept with the temporary vows Paul sponsors.

Numbers 6:9 requires shaving if a Nazirite becomes defiled — a different scenario from the completed vow shaving Paul pays for, yet still Nazirite law.