Tafsir of Al-Kahf 18:38

لكنا هو الله ربي

But as for my part, (I believe) that He is Allah, my Lord, meaning, `I do not say what you say; rather I acknowledge the Oneness and Lordship of Allah,'

وﻻ أشرك بربي أحدا

and none shall I associate as partner with my Lord. meaning, He is Allah, the One Who is to be worshipped Alone, with no partner or associate. Then he said:

ولوﻻ إذ دخلت جنتك قلت ما شاء الله ﻻ قوة إﻻ بالله إن ترن أنا أقل منك ماﻻ وولدا