26 Then taking the men on the next day, being purified with them, Paul went into the temple, declaring the fulfillment of the days of the purification, until an offering should be offered for each of them.
Acts 21:26 Cross References - MKJV
Numbers 6:13-20
13 And this is the law of the Nazarite, when the days of his separation are fulfilled. He shall be brought to the door of the tabernacle of the congregation.
14 And he shall offer his offering to Jehovah: one male lamb of the first year without blemish for a burnt offering, and one ewe lamb of the first year without blemish for a sin offering, and one ram without blemish for peace offerings,
15 and a basket of unleavened cakes of fine flour, cakes mixed with oil, and unleavened wafers anointed with oil, and their food offerings and their drink offerings.
16 And the priest shall bring them before Jehovah and shall offer his sin offering and his burnt offering.
17 And he shall offer the ram for a sacrifice of peace offerings to Jehovah, with the basket of unleavened bread. The priest shall offer also his food offering and his drink offering.
18 And the Nazarite shall shave the head of his separation at the door of the tabernacle of the congregation, and shall take the hair of the head of his separation and put it in the fire under the sacrifice of the peace offerings.
19 And the priest shall take the boiled shoulder of the ram and one unleavened cake out of the basket, and one unleavened wafer, and shall put them on the hands of the Nazarite, after his separation has been shaved.
20 And the priest shall wave them for a wave offering before Jehovah. This is holy for the priest, with the wave breast and heave shoulder. And afterward the Nazarite may drink wine.
Acts 21:24
24 taking them, be purified with them, and be at expense for them, so that they may shave their heads. And all may know that what they have been told about you is nothing, but you yourself also walk orderly and keep the Law.
Acts 24:18
18 Among which certain Jews from Asia found me purified in the temple, not with a crowd nor with tumult.
1 Corinthians 9:20
20 And to the Jews I became as a Jew, so that I might gain the Jews. To those who are under the Law, I became as under the Law, so that I might gain those who are under the Law.