Num 6:21
“This is the law of the Nazarite, who vowed his sacrificial gifts to the Lord on the ground of his consecration,” i.e., who offered his sacrifice in accordance with the state of a Nazarite into which he had entered. For the sacrifices mentioned in Num 6:14. were not the object of a special vow, but contained in the vow of the Nazarite, and therefore already vowed (Knobel). “Beside what his hand grasps,” i.e., what he is otherwise able to perform (Lev 5:11), “according to the measure of his vow, which he vowed, so must he do according to the law of his consecration,” i.e., he had to offer the sacrifices previously mentioned on the ground of his consecration vow. Beyond that he was free to vow anything else according to his ability, to present other sacrificial gifts to the Lord for His sanctuary and His servants, which did not necessarily belong to the vow of the Nazarite, but were frequently added. From this the custom afterwards grew up, that when poor persons took the Nazarite’s vow upon them, those who were better off defrayed the expenses of the sacrifices (Act 21:24; Josephus,Ant. xix. 6, 1; Mishnah Nasir, ii. 5ff.).