The sacrifice of his being, made by Abu Bakr, had overwhelmed him with joy bringing warmth to his heart, and triumphed over the evil effects of the poison that had begun to freeze his limbs, so that directly the Prophet rubbed the poisonous wound with a little of his saliva, all pain and swelling disappeared. The Quraish, disturbed and maddened by the flight of Mohammad and Abu Bakr, despatched two town-criers, one on each side of the city of Makkah, charging them to offer a reward of a hundred she-camels for anyone who should overtake the fugitives. The most cunning trackers set out in all directions. Abu Jahal lost no time in rushing to Abu Bakr's dwelling, and knocked furiously at the door. Asma, Ayishah's sister, came out to him. 'Where is thy father?' he asked.--'By God! I know not,' she replied. He lifted his hand and slapped her face so brutally that he tore out one of her earrings. He then rejoined a group of young men who were following a clue that took them to the Jabal Saur. Scarcely had His Apostle sought shelter in the grot, then Allah ordered a shrub, grown to about a man's height, and known as "Umm-ul-Ghilan," a little way off from the cave, to leave the spot where it flourished and block up the entrance. Then He sent a spider to spin its web between the branches of the shrub and the jagged edges of the cavern's mouth; and also a pair of wild pigeons that built a nest and laid eggs in the narrow entrance. At that juncture, the trackers began to arrive from all parts, enticed by the bait of the reward; but they were brought to a standstill by the fragile barrier built by the most humble among insects: a web that the slightest breath of the breeze sufficed to destroy. 'There is nothing to be done in this cave,' declared one of the Unbelievers, Ummayyata ibn Khalaf, just as they were getting ready to enter. 'See this cobweb. It dates, without a doubt, from before the birth of the man we are pursuing. How could Mohammad have entered the cave without tearing these slender threads? And look at those pigeons' eggs. Would he not have broken them as well?' All found these deductions well-grounded and gave up a search that seemed futile. Abu Jahal was the only one who guessed they were on the right track. 'Nevertheless, I feel that our enemy is not far off,' he said. 'He is looking at us now, but magic spells cloud our eyes!' They went away, never thinking about searching on the ground for the tell-tale traces of the fugitives' footsteps. While this scene was being enacted, Abu Bakr trembled greatly; not for his own life, but for that of his companion, to whom he said: 'My death means nothing more than a man dying; but thine means all the lives of thy disciples!'