From your NIV:
Isaiah 7
10 Again the Lord spoke to Ahaz, 11 “Ask the Lord your God for a sign, whether in the deepest depths or in the highest heights.”
12 But Ahaz said, “I will not ask; I will not put the Lord to the test.”
13 Then Isaiah said, “Hear now, you house of David! Is it not enough to try the patience of humans? Will you try the patience of my God also? 14 Therefore the Lord himself will give you[c] a sign
Had to search for some of the others:
Judges 6:36-40
New International Version
36 Gideon said to God, “If you will save Israel by my hand as you have promised— 37 look, I will place a wool fleece on the threshing floor. If there is dew only on the fleece and all the ground is dry, then I will know that you will save Israel by my hand, as you said.” 38 And that is what happened. Gideon rose early the next day; he squeezed the fleece and wrung out the dew—a bowlful of water.
39 Then Gideon said to God, “Do not be angry with me. Let me make just one more request. Allow me one more test with the fleece, but this time make the fleece dry and let the ground be covered with dew.” 40 That night God did so. Only the fleece was dry; all the ground was covered with dew.
2 Kings 20:8-11
New International Version
8 Hezekiah had asked Isaiah, “What will be the sign that the Lord will heal me and that I will go up to the temple of the Lord on the third day from now?”
9 Isaiah answered, “This is the Lord’s sign to you that the Lord will do what he has promised: Shall the shadow go forward ten steps, or shall it go back ten steps?”
10 “It is a simple matter for the shadow to go forward ten steps,” said Hezekiah. “Rather, have it go back ten steps.”
11 Then the prophet Isaiah called on the Lord, and the Lord made the shadow go back the ten steps it had gone down on the stairway of Ahaz.