Quran 18:60 from Surah Al-Kahf on Divine Marvels.
وَإِذۡ قَالَ مُوسَىٰ لِفَتَىٰهُ لَآ أَبۡرَحُ حَتَّىٰٓ أَبۡلُغَ مَجۡمَعَ ٱلۡبَحۡرَيۡنِ أَوۡ أَمۡضِيَ حُقُبٗا
English translation: And when said Musa to his boy Not I will cease until I reach the junction (of) the two seas or I continue (for) a long period
Transliteration: wa-idh qala musa lifatahu la abrahu hatta ablugha majma'a al-bahrayni aw amdiya huquban