Then Paul took the men and on the next day he purified himself with them (autois | αὐτοῖς | dat pl masc3rd) and went into the temple, giving notice of the completion of the days of the purification, at which time the sacrifice would be offered on behalf of each one of them (autōn | αὐτῶν | gen pl masc3rd).
Reference
Acts 21:26
Sequence
2698