According to the law of signs in 1 Corinthians 14, signs speak to the rebels that will not hear the word of God, prophecy, as if the kingdom of God came by observation, walking by sight and not the unseen faith in respect to God ... who refused to be worshipped in regard to an image (form)as that seen walking by sight .
Numbers 20:10And Moses and Aaron gathered the congregation together before the rock, and he said unto them, Hear now, ye rebels; must we fetch you water out of this rock?
The sign was not for those who did believe prophecy.
Again in Exodus the signs for those who refuse to hear prophecy.
Those who did knew the four hundred years prophesied through Abraham were moved to believe . The sign moved the unbeliever to let the people of God go. They did not believe to the salvation of their souls as those who do believe prophecy
Exodus 4 King James And Moses answered and said, But, behold, they will not believe me, nor hearken unto my voice: for they will say, The Lord hath not appeared unto thee. And the Lord said unto him, What is that in thine hand? And he said, A rod.
(same dividing rod used against those who rebel in the Numbers 20 account above ) And he said, Cast it on the ground. And he cast it on the ground, and it became a serpent; and Moses fled from before it.And the Lord said unto Moses, Put forth thine hand, and take it by the tail. And he put forth his hand, and caught it, and it became a rod in his hand:That they may believe that the Lord God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, hath appeared unto thee.And the Lord said furthermore unto him, Put now thine hand into thy bosom. And he put his hand into his bosom: and when he took it out, behold,
his hand was leprous as snow.(Dead as in no senstivity to the Holy Spirit )And he said, Put thine hand into thy bosom again. And he put his hand into his bosom again;
(raised to new spirt life) and plucked it out of his bosom, and, behold, it was turned again as his other flesh. 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.
Again, not believed as unto salvation an anchor to the soul as with prophecy.