The Cave of Thawr
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The Messenger of Allah and Abu Bakr left Makkah secretly. Abu Bakr asked his son, Abdullah ibn Abi Bakr, to find out what people were saying about them in Makkah and he asked 'Air ibn Fuhayrah, his freed slave, to graze his milking sheep in the daytime but to bring them to the each night. Asma' bint Abi Bakr would bring them food.
They went to the Cave of Thawr. Abu Bakr went in first to clean it up and to make sure that it was safe so that nothing could harm the Messenger of Allah. Once he was satisfied he called him in.
When they were inside Allah sent a spider to spin a web from a bush across the entrance to the cave. It concealed the fact that the Messenger of Allah and Abu Bakr had only just gone in. Allah also commanded two wild doves to fly down between the spider and the tree. They made a nest there and laid eggs. 'To Allah belong the armies of the heavens and the earth.' (48: 4)
The idol-worshippers followed the tracks of the Messenger of Allah's party, but when they reached the mountain they became confused. They climbed up the hillside passing close to the cave. However, when they saw the spider's web they said, 'If anyone had entered here, there would not be a spider's web across the opening. Then, they rode on. Abu Bakr saw the idol-worshippers coming. In alarm he said, 'Messenger of Allah, if one of them steps forward, he will see us.'
The Messenger of Allah replied, 'Why worry about two when Allah is the third!'
Allah says in the Qur'an, .. the second of the two; when the two were in the Cave, when he said to his companion, "Grieve not. Allah is with us." '(9: 40)