Surat Al Kahf (59-60)

{وَتِلْكَ الْقُرَى أَهْلَكْنَاهُمْ لَمَّا ظَلَمُوا وَجَعَلْنَا لِمَهْلِكِهِم مَّوْعِداً} (الكهف: 59)

59- People of previous nations such as the people of `Ad, Thamud, Lut, We destroyed them when they disbelieved in Allah's Signs and belied His Messengers. We have set a fixed time for their destruction, so they won't bypass it, therefore do not be tempted by Allah's Respite to them.

{وَإِذْ قَالَ مُوسَى لِفَتَاهُ لَا أَبْرَحُ حَتَّى أَبْلُغَ مَجْمَعَ الْبَحْرَيْنِ أَوْ أَمْضِيَ حُقُباً} (الكهف: 60)

60- And remember the saying of Allah's Prophet, Moses, to his servant, Joshua ibn Nun, whose name was reported in Sahih Al Bukhari and Sahih Muslim: I shall proceed until I reach the point of the two seas gathering and perhaps the location is between the Mediterranean and the Red sea even if it takes long time.

Once Moses stood up and addressed Bani Israel. He was asked who was the most learned man amongst the people. He said, 'I.' Allah admonished him as he did not attribute absolute knowledge to Him (Allah). So, Allah said to him, 'Yes, at the junction of the two seas there is a Slave of Mine who is more learned than you . [Reported by Al Bukhari and Muslim with the wordings of Al Bukhari].