'What's' in the Bible

Jesus asked the man, "What's your name?"

So he called for him and asked him, "What's this I hear about you? You can't be my manager any longer. Now give me a report about your management!'

"The person who is on the housetop that day must not come down to get his belongings out of his house. The person in the field, too, must not turn back to what's left behind.

But Jesus told them, "What's frightening you? And why are you doubting?