Tafsir of Ash-Shu`ara' 26:156

And touch her not with harm, lest the torment of a Great Day should seize you. He warned them of the punishment of Allah if they should do her any harm. The she-camel stayed among them for a while, drinking the water, eating leaves and grazing, and they benefited from her milk which they took in sufficient quantities for every one to drink his fill. After this had gone on for a long time, and the time for their destruction drew near, they conspired to kill her:

فعقروها فٲصبحوا نادمين