'Exchange' in the Bible

for what is a man profited if he may gain the whole world, but of his life suffer loss? or what shall a man give as an exchange for his life?

Or what shall a man give as an exchange for his life?

and he said unto them, 'What are these words that ye exchange with one another, walking, and ye are sad?'

lest any one be a fornicator, or a profane person, as Esau, who in exchange for one morsel of food did sell his birthright,