(Al-Kahf) 18 : 60
وَإِذْ قَالَ مُوسَىٰ لِفَتَاهُ لَا أَبْرَحُ حَتَّىٰ أَبْلُغَ مَجْمَعَ الْبَحْرَيْنِ أَوْ أَمْضِيَ حُقُبًا
And remember when Moses said his assistant: "I will not stop until I reach the junction of the two seas or continue for a long period".
Messenger Moses and his assistant Joshua were going to meet Angel Khidr for getting special knowledge from Lord.