Isaiah 7:14 Therefore the Lord himself will give you a sign: the virgin will conceive and give birth to a son, and will call him Immanuel.
I know we are told not to tempt God especially with verses like those describing how Jesus was tempted by Satan, but these words come long before Jesus was living amongst us in human form.
Ahaz was adamant he would not tempt God, so God told Isaiah he should tell Ahaz a sign would be shown; one which could not be ignored!
God will go out of His way to allow us to know the truth; do we dare to listen?