'Demonstrating' in the Bible

These words of Ish-bosheth really angered Abner and he said, "Am I the head of a dog that belongs to Judah? This very day I am demonstrating loyalty to the house of Saul your father and to his relatives and his friends! I have not betrayed you into the hand of David. Yet you have accused me of sinning with this woman today!

explaining and demonstrating that the Christ had to suffer and to rise from the dead, saying, "This Jesus I am proclaiming to you is the Christ."

for he refuted the Jews vigorously in public debate, demonstrating from the scriptures that the Christ was Jesus.