Acts 21:24
Take these men and observe the ceremony of purification with them, pay their expenses so they can shave their heads [i.e., to signify that they are making a vow] and [then] everyone will know that there is no truth in what people have been told about you, but that you, too, are living properly and observing the law of Moses.
Acts 21:26
Then Paul took the men and the next day he observed the ceremony of purification with them. Then he went into the Temple, declaring [to the priest] when he would fulfill the [required] days of the purification [ceremony] and [be ready] for the sacrifices to be offered for each of them.
Acts 24:18
While doing this, they [i.e., the Jews] found out that I had undergone the rites of purification in the Temple. There was no crowd and no commotion. But certain Jews from [the province of] Asia
Acts 18:18
After this [incident] Paul remained [in Corinth] for some time before leaving the brothers and sailing for Syria with Priscilla and Aquila. Paul shaved his head while in Cenchrea as part of a vow he had taken.
John 3:25
[About then] a dispute arose between John's disciples and a Jew over ceremonial cleansing.
John 11:55
Now the Jewish Passover Festival was to be held soon and many people went up to Jerusalem from the countryside before the [actual] Festival in order to perform the ceremonial purification rituals.
1 Corinthians 9:20
I behaved like a Jew in front of the Jews in order to win Jews [to Christ]. I behaved like a person who was under [obligation to observe] the law [i.e., Jews] in front of those who observe that law, although I was not [really] under [obligation to] it. I did this to win those who are under [obligation to observe] the law.
Galatians 2:12
For, before certain [leaders] came from James [i.e., Jesus' brother, a leader of the Jerusalem church, See Acts 12:17; 15:13-22], he had eaten [a social meal] with some Gentiles. But when these men came, he abruptly discontinued this practice out of fear of the circumcised ones [i.e., out of concern for what the Jews would think of him].
Hebrews 9:10-14
since, with foods and drinks and various [ceremonial] washings, they are only outward regulations imposed until the time when everything would be made right [i.e., under the New Agreement].