'Subject' in the Bible

When they heard Paul speak of a resurrection of dead men, some began to scoff. But others said, "We will hear you again on that subject."

the promise which our twelve tribes, worshipping day and night with intense devotedness, hope to have made good to them. It is on the subject of this hope, Sir, that I am accused by the Jews.

So they arranged a day with him and came to him in considerable numbers at the house of the friends who were entertaining him. And then, with solemn earnestness, he explained to them the subject of the Kingdom of God, endeavouring from morning till evening to convince them about Jesus, both from the Law of Moses and from the Prophets.