'Whether' in the Bible

As the people were in expectation, and all men reasoned in their hearts concerning John, whether perhaps he was the Christ,

The scribes and the Pharisees watched him, to see whether he would heal on the Sabbath, that they might find an accusation against him.

Therefore see whether the light that is in you isn't darkness.

Or what king, as he goes to encounter another king in war, will not sit down first and consider whether he is able with ten thousand to meet him who comes against him with twenty thousand?