Catena Fidei

Acts 21:23 (WEB)
Therefore do what we tell you. We have four men who have taken a vow.

Catechism · 1

§2102Article 1 · The First CommandmentRead at vatican.va
“By fulfilling his vows he renders to God what has been promised and consecrated to Him. the Acts of the Apostles shows us St. Paul concerned to fulfill the vows he had made.” — Catechism footnote: Cf. Acts 18:18; 21:23-24.

Eusebius of Caesarea, Church History II.23Book II
“And he was in the habit of entering alone into the temple, and was frequently found upon his knees begging forgiveness for the people, so that his knees became hard like those of a camel, in consequence of his constantly bending them in his worship of God, and asking forgiveness for the people.” — editor's note: “The dramatic account of James by Hegesippus is an overdrawn picture from the middle of the second century, colored by Judaizing traits which may have been…
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John Cassian, Conferences XI–XVII XVII.20Conference XVII
“These take and sanctify thyself with them and bestow on them, that they may shave their heads; and all will know that the things which they have heard of thee are false, but that thou thyself also walkest keeping the law.”” — editor's note: Acts xxi. 20–24.
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Tertullian, On Monogamy Chapter 14
“…to suit the circumstances of the times: circumcising Timotheus on account of “supposititious false brethren;” and leading certain “shaven men” into the temple on account of the observant watchfulness of the Jews—he who chastises the Galatians when they desire to live in (observance of) the law.” — editor's note: Comp. Acts xxi. 20–26.
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Tertullian, The Five Books Against Marcion V.2Book V
“He therefore made some concession, as was necessary, for a time; and this was the reason why he had Timothy circumcised, and the Nazarites introduced into the temple, which incidents are described in the Acts.” — editor's note: Acts xxi. 23–26.
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