[And when waves cover them like canopies]—meaning like mountains. [And among them are those who are moderate]—this refers to the believer. As for the disbeliever, he returns to his disbelief. [And none rejects Our signs except everyone treacherous]—meaning treacherous—[ungrateful]. It is said: He was sincere to Him while at sea due to the fear of drowning, then he acted treacherously.

Surah Luqman (from verse 33 to verse 34).