"If they will not believe you," he said, "and will not listen to the sermon of the first sign, then they will believe the word of the subsequent sign
Other versions
King James Version
And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign.English Standard Version
"If they will not believe you," God said, "or listen to the first sign, they may believe the latter sign.New International Version
Then the LORD said, "If they do not believe you or pay attention to the first miraculous sign, they may believe the second.