'Zealous' in the Bible

And they having heard it glorified God, and said to him, Thou seest, brother, how many myriads there are of the Jews who have believed, and all are zealous of the law.

I am a Jew, born in Tarsus of Cilicia, but brought up in this city, at the feet of Gamaliel, educated according to the exactness of the law of our fathers, being zealous for God, as ye are all this day;