NET
30 So they said to him, “Then what miraculous sign will you perform, so that we may see it and believe you? What will you do?
Darby
30 They said therefore to him, What sign then doest thou that we may see and believe thee? what dost thou work?
KJV
30 They said therefore unto him, What sign shewest thou then, that we may see, and believe thee? what dost thou work?