G3971–πατρῷος–patrōos

"I am a Jew, born at Tarsus in Cilicia, but brought up in this city. I was carefully trained at the feet of Gamaliel in the Law of our forefathers, and, like all of you to-day, was zealous for God.

πατρῴου patrōou “of our Fathers”

But this I confess to you--that in the way which they style a heresy, I worship the God of our forefathers, believing everything that is taught in the Law or is written in the Prophets,

πατρῴῳ patrōō “ancestral”

After one complete day he invited the leading men among the Jews to meet him; and, when they were come together, he said to them, "As for me, brethren, although I had done nothing prejudicial to our people or contrary to the customs of our forefathers,

πατρῴοις, patrōois “of our fathers,”