And the people of Ṣāliḥ said to him:

“Bring us a sign, if you are truly among the truthful.” He replied, “Here is a she-camel; she has her share of water, and you have your share on a known day.” ⦗ash-Shuʿarāʾ: 154⦘

And He said:

“This is Allah’s she-camel, a sign for you.” ⦗al-Aʿrāf: 73⦘

And the Messiah said:

“I have come to you with a sign from your Lord: I fashion for you out of clay the form of a bird, then breathe into it and—by Allah’s leave—it becomes a bird. I heal the blind and the leper, and I bring the dead to life—by Allah’s leave. I also tell you what you eat and what you store up in your homes. Surely in that is a sign for you, if you are believers.” ⦗Āl ʿImrān: 49⦘

And with regard to Muhammad:

“No sign from among the signs of their Lord comes to them without their turning away from it. They have already rejected the truth when it reached them, but soon the news of what they were wont to mock will come to them.” ⦗al-Anʿām: 4⦘