Numbers 6:12 (BSB)

He must rededicate his time of separation to the LORD and bring a year-old male lamb as a guilt offering. But the preceding days shall not be counted, because his separation was defiled.

From Numbers 6. Also in the ESV.

Commentary on Numbers 6:12

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 6:1-21: After the law for the discovery and shame of those that by sin had made themselves vile, fitly follows this for the direction and encouragement of those who by their eminent piety and devotion had made themselves honourable, and distinguished themselves from their neighbours.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 6:12: And this is the law of the Nazarite,.... This has respect either to what goes before; those are the things he is obliged to that vows the vow of a Nazarite; what he is to abstain from during the time of his vow, and what he is to do in case of any defilement; or to what follows after, what is binding upon him, what...
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 6:12: And he shall consecrate unto the LORD the days of his separation, and shall bring a lamb of the first year for a trespass offering: but the days that were before shall be lost, because his separation was defiled. (f) Beginning at the eighth day, when he is purified. (g) So that he shall begin his vow anew.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 6:12: Num 6:12 He was then “to bring a yearling sheep as a trespass-offering;” and the days that were before were “to fall,” i.e., the days of consecration that had already elapsed were not to be reckoned on account of their having fallen, “because his consecration had become unclean.” He was therefore to commence the whole time of his consecration entirely afresh, and to observe it as required by the vow.