'Exchange' in the Bible

Elisha told Gehazi, "Tuck your robes into your belt, take my staff, and go! Don't stop to exchange greetings with anyone! Place my staff on the child's face."

Then they went in to offer sacrifices and burnt offerings.Now Jehu had stationed for himself eighty men outside, and he had said, “The one who permits any of the men whom I bring into your hands to escape shall give up his life in exchange.”