'Whether' in the Bible

Now while the people were in a state of expectation and all were wondering in their hearts about John, as to whether he was the Christ,

Whether he comes in the second watch, or even in the third, and finds them so, blessed are those slaves.

Or what king, when he sets out to meet another king in battle, will not first sit down and consider whether he is strong enough with ten thousand men to encounter the one coming against him with twenty thousand?

When Pilate heard it, he asked whether the man was a Galilean.