﴿ وَإِذْ قَالَ مُوسَىٰ لِفَتَىٰهُ لَآ أَبْرَحُ حَتَّىٰٓ أَبْلُغَ مَجْمَعَ ٱلْبَحْرَيْنِ أَوْ أَمْضِىَ حُقُبًۭا ﴾

“AND LO! [In the course of his wanderings,] Moses said to his servant: "I shall not give up until I reach the junction of the two seas, even if I [have to] spend untold years [in my quest]!"”

And mention when Moses son of Amram ‘Imrān said to his lad Joshua son of Nun Yūsha‘ bin Nūn who used to follow him around serve him and acquire knowledge from him ‘I will not give up I will not stop journeying until I have reached the juncture of the two seas — the point where the Byzantine sea and the Persian sea meet beyond the east — though I march on for ages’ for a very long time before reaching it if it be far.