Paul wanted Timothy to accompany him (autō | αὐτῷ | dat sg masc3rd), so he took him and circumcised him (auton | αὐτόν | acc sg masc3rd) because of the Jews who were in those places; for they all knew that his (autou | αὐτοῦ | gen sg masc3rd) father was a Greek.
Reference
Acts 16:3
Sequence
2602